What best joke you ever did to friend(enemy)?

That is fucked up man.

Damn. If he signs anything important, that could screw him up. Play jokes in jest, not to harm.

Not too good at jokes, but, i sayed to a friend that "1.ooskar.com"(dont get on that page) was a free steam games page, he entered, and he saw the "suprise", i laughed so hard but then he got angry and didnt talked to me about a month and some weeks

A friend came to my house to sleep. I was telling him we have gnomes in my house (my family has a lot of statues of gnomes), and sometimes hear the footsteps of someone walking down the third floor of my house (true) .
Then another friend who was left to sleep, we decided to play a joke and we put one of those statues on the little table beside the bed. When he opened his eyes and saw it, he jumped out of bed and got scared and started to insult us in every language possible XD

I threw a live grenade at her, chained to a viper and locked her in a room with anthrax. We had a good laugh around the hospital bed.