What are some game bosses you curse to your dying breath?

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some furier mode bosses from furi game, like the sniper (for reasons I don't want to spoil cuz it's a very cool game)

Uber Soldat - Return To Castle Wolfenstein.

Behemoth from V rising. Fkin hard Boss... Especially when I try to solo it. Lol

Lud and Zallen in frigid outskrits in dark souls 2.
Never have I though that I would rather fight Bed of chaos than this.
If you die, the closest run to the boss is laying down in a coffin, skip a cutscene and transition to a different area, literally run through a snow storm while respawaning unicorn(they aren't really unicorn but that's not the point) from hell chase you. All of this for a boss thst you already fought one on one but it's 2v1 now.

fighting Kiryu as Saejima in Yakuza 4 was one of the most frustrating and shitty difficulty spikes i've ever had the misfortune of living through and i get pissy just thinking about it now. i'm not the kind of person who yells verdictives as i play but i totally was during that fight.

Many annoying bosses in MGR:R. Annoying game overall, i did not enjoy playing it at all. Omega Weapon in FFVIII is also pretty hard to beat and have very annoying attacks. It's quite easy with invincibility though, naturally, as there are items that grant this in the game. Or you can just use the Selphie Limit Break (which though is quite hard to get). Also any monster, boss or not, that casts Confuse in any FF game, annoys the sht out of me. Let me think of more annoying bosses. Yes there is "The End" in MGS3. And also that fire boss and the end boss (some robot) is really annoying too. Yes and there is "Baba Yaga" boss in Rise of the Tomb Raider as well.

Adding Nitrous Oxide from Crash Team Racing to the list, dude literally jumps ahead in the race, throws infinite ammo pick-ups in your way and is insanely faster than you so you have to know all the tricks and all the shortcuts. Better quality video from the remake here.