145. Robert Downey Jr.
Robert Downey Jr. is a comic genius. Making him unfunny stands as SNL's most towering achievement in terms of sucking. How do you fuck up a sure thing like Downey? He's funny in anything. I mean, dude was funny in Weird Science. He was funny in Johnny Be Good. He was funny in Iron Man. But he met his Kryptonite, and it was SNL, where he spent the 1985-1986 season sucking up a storm. His greatest hit? A fart-noise debate with Anthony Michael Hall. In a perverse way, the Downey Fail sums up everything that makes SNL great. There are no sure things. No rules. No do-overs. No safety net — when you flop on SNL, you flop big. And that's the way it should be. The cameras roll at 11:30, ready or not. Live from New York — it's Saturday Night.