What's the most frightening or scariest thing that has happened to you or somone you know?

So I can't exactly regale any horror stories about myself properly. I have bad enough anxiety that a person walking on the opposite pavement sends me into near vomit inducing "Ima die" panic. But the scariest thing that happened outside of my own overblown issues involves one of my cats.
A good 8 or 9 years ago we got a call from mum a couple of mins after she had left for work. Turns out some utter insert multiple strongly worded remarks about these two women had hit our cat with their car. She pulled over to have a look and they bolted the second they realised he belonged to her. It was only a couple of roads away so we all sprinted down there as fast as we could. He had limped into the opening of the small forest that bordered the nearby park. Of which there was no way to get to him. Badly maintained fencing allowed him to slip under but not us, and the foliage was too dense to do more than barely see him. God he must have been so hurt and scared. We could hear him mewing but couldn't get to him. And unfortunately he then dragged himself off and hid further away.

We all spent the ENTIRE bloody day searching for him nonstop. One of us always home just in case. Running down streets, searching the forest etc. It wasn't until almost midnight my sister phoned, currently designated as the at home person, saying he had just turned up at the back door. It took him the entire day but he managed to drag himself all the way back home to us. I just remember his terrified little face as mum cradled him in a towel as my parents got him in the car and rushed to the vets. Quicker for them to go without us so we just cleaned up the blood and prepared to wait for the worst. He survived. Thank fucking god he survived. And it's still wobbly to this day (and causes him some health problems) but they managed to repair the shattered bones on his hip and leg. But I don't believe I have ever been more scared than on that day.

I was maybe around 9 or 10 when I went to a summer camp organized by the military. We slept in one of these 20 man tents.
One night a wild boar got into the tent (since they somehow kept the two sides open) and and stepped on one of the kids cots until it collapsed....I don't remember too much anymore but we closed the tents the following days and the boars ripped holes in the tent but did not come in anymore.
Pretty scary as boars are quite scary anyway and even more so as 10 year olds. I also saw a lynx there the night before, but it did not do anything but stand outside the tent.

I was stopped at a red light on my way home from work, in a shady part of town, when a car pulled up next to me and the passenger pointed a gun out of his window and right at me. I don't know if he said anything because at that point I popped the clutch on my Mustang GT, ran the light and got the Hell out of there. Scariest thing i have ever experienced.

Being a bystander during an armed robbery was pretty scary in hindsight (i didnt realize what had happened until armed coppers showed up xD)

I had some encounters with evil dogs when I was a paperboy. Got bitten twice and got chased numerous times. Guard dogs, not those shitty chihuahua types.
I always have loved animals but I'm not too fond of dogs since then.

The scariest thing that happened to me was when I was driving with my 1 yo son in the back and the car suddenly catched fire. The fire spreaded quickly but I was fast enough to get us both to safety.

i know nobody will believe me but my home seems haunted, i've seen a few ghosts there one of which even made wet footprints on the floor. these scared the shit out of me. also i have an old music box that sometimes starts randomly playing its song. my english is too bad to find the right words to explain it in detail, so im sorry.

also had some very scary encounters with big dogs.

I got into jail even though that it might not be something that would normally frighten me but since I was in shock over what had happened and I was unaware of consequences, such left a mental scar on me and I had to deal with the aftermath and additional meltdown; the pressure of oblivion sort of broke me. suppose, that was quite distressing for me.

This happened last Saturday... (3 days ago)
I was heading to my university for an exam, when two men decided to rob me in public. It was 10am, and I was in a tram with tons of other passengers, when one guy behind me locked his arms around my neck and and another bigger guy blocked my exit. They asked for my phone which I refused to give. Everyone else seemed either oblivious to what was happening until I tried to free myself which ended me falling on the floor. The dude who had his arms around my neck was clenching my neck tighter, when they both just stood up and exit the tram. I was about to leave too because that was my stop, but an old lady told me not to in case they tried to do it again outside. (I was thinking about my exams that I didnt even realise what I was doing. I even tried explaining to everyone that I had to go to uni so that I'm not late. Now I realise that lady probably saved my ass) Anyway, I went out on the next 2 stops and walked to my uni. Was late for my exams and when I told the examiner why I was late he was like wtf. lol. Anyway got extra time to do my exams.

For context this happened near Paris, France, at a rough area (Bobigny) Lots of weird shady shits over here. Oh well, at least I didnt lose anything and didnt get hurt. Im carrying pepper spray from now on. yep.

I tried to write a comment about my past, but it's something very personal that affected me greatly emotionally, and just recalling memories gives me anxiety... so I guess I'm not ready to open up to strangers on the internet about this one just yet. :P

I'll go with something that happened last summer, not something super scary, but it's recent so why not - I was fixing a garage roof with my brother and while climbing a ladder with a hammer (it was an old, wooden ladder, which I recommend avoiding, go with aluminum instead as it won't deteriorate as quickly), one of the rungs broke under my foot - in normal case, I'd have both hands firmly on the ladder for such possibilities, but as I said before I had a hammer in my hand so at this moment I only held the ladder with one hand...

My legs went through the opposite side of the ladder and my body flipped backwards while the ladder fell. By the force of some mysterious ninja reflexes, I managed to throw the hammer away from where it could harm me, then leaned forward so that my back would hit the ground instead of my head, and placed my hands upwards to prevent the ladder from hitting me when I reached the ground (human reflex and instinct is pretty insane).

Now, the ground was just dirt/grass and it was a 1-storey building so you'd think this wasn't really such a big deal, and it wasn't, I only got a few bruises. The reason it was so scary is that we were ripping away old planks from the roof, with the nails still on. Guess where we were throwing those? That's right - right below, on the ground, over which the ladder was leaning against the wall. Now the good news is that our father has always taught us to put safety before all, and we had been regularly moving the nailed planks out of the way, and placed them nails-side-down. The reason this scared me is because for a split second there, while I fell, I was unsure if we really had removed the planks.

Lesson here kids, always exercise work safety. Even when you're careful, one little misstep or overlook can be fatal. Had we not moved the planks away from the building, I might have ended up as skewered meat and suffered from several wounds. Safety first. :P

Uhh... in my life I have had many stupid and even dangerous situations, I will tell about some of them
so

Hitchhiking. I managed to get stuck in Romania in the middle of nowhere at night, when I decided to set up the tent, then a guard of some warehouse near my dislocation comes to me, he lit a lantern and was armed and the problem is I - don't know Romanian language, as a result, I took my things and went away. When he walked two kilometres, he follow me with his car and again spoke something in Romanian and light in my face. Everything ended well and I spent the night in his warehouse, and in the morning he brought me to the road - Google translator saves

There was also a situation - I went swimming and the water was cold and I get a spasm, it was almost impossible to breathe and I miraculously got out of the water.

Another story when my friends (they are punks) went for a walk and got drunk. Everything would be fine, but we got home to one of their friends. Everything was broken down at home and there were some drunk alcoholics inside. As a result, we drank together, these guys started fighting each other, knife in someone's hands, blood and one wounded, we called an ambulance and left from there

once walked with a friend, we went to an abandoned building where he used drugs (they are forbidden in our country) and a police patrol was nearby and just then they went to inspect the neighbourhood, luckily we went on the roof and waited there all time

One day I and my friends walked in the city, drank a little and got into the area where the neo-nazis were, and they were armed with knives, telescopic batons, and they attacked our company. There were lots of them, but as a result, they got pepper gas in their faces

the worst thing for me was when I drank a litre of cheap energy and smoked weed, the result was tachycardia and I thought I would die

also had sleep paralysis several times

once drank with a friend and his older brother from one bottle and later I learned that he had tuberculosis and hepatitis

currently alive

sorry for bad english as it is not my native language

This happened back when I was still attending 7th grade middle school. I had gotten home from school about an hour after and gotten a call on my phone. It was just a regular wireless house phone; I didn't have a cellphone until I was a high school freshman. When I answered the phone, I could vaguely make out the words but it sounded like two people were having a conversation. One of them was talking to the other, but I couldn't make out what he said. I guess he was telling the other person about who answered the phone, because the other person asked, "Is she hot?"

Weird thing is... I'm not a girl and nor do I sound like one thanks to my deep voice.
Second weird thing is that same line I heard was what I had told a classmate earlier that same day.

Another time... Like, maybe 8-9 years later I get a wake-up call from some lady telling me something like, "Hola, el Diablo. Quiero esta muerto hoy." Lady hung up on me shortly after I answered, but the funny part is that the last four digits of my cellphone are 6666, so I expect many more admirers in the future.