SNK have a reputation for churning out masochistic fighting games with notoriously cheap CPU opponents. Notable examples are the Art of Fighting game series and Real Bout Fatal Fury Special where the A.I. were rigged as hell. Worst being the bosses, these guys are just flat out vicious to say the least. None more so than Nightmare Geese Howard who, as of now, I still haven't beaten. 4 airborne projectiles, hugely damaging combos, high defense, more range and practically all his moves gets priority. Ridiculous boss, makes Capcom fighters seem like child's play.

I always found Galerians to be pretty sadistic... I mean, between ripping someone apart with your mind, and making them kill themselves... you had an arsenal of psychic mind tricks that was pretty damn depraved... sadly, the sequel lost all of that, and went for a more Teenish plot, which was represented in the rating drop from M to T for said sequel. That said, though, my memory of the game may be jaded, since I haven't played it since I got a PS2 so long ago.

I'm going to say Football. The reason being, I'm a very sore loser when it comes to playing it, especially when my friends are winning or get interceptions or something, I've almost broken my controller several times. Damn Madden.