The most recent one I remember: yesterday, I played a bit of Super Smash Bros. Melee, event match #42, Trouble King 2. For those who have never played that event, it's you (Luigi) against a single computer opponent (Bowser). You've both got two lives, no time limit.
Thing is, Bowser is HUGE, you're not. Most of his attacks are enough to KO you without him really trying, he can soak a ton of damage before flying, his reack is about 5-7 times yours, and he attacks CONSTANTLY! Truly a test of your skill and wits!
I won because the CP decided to ignore the fact that he was going offscreen, and just fell to his death...