When Tina Fey and Amy Poehler ragged on George Clooney at this year’s Golden Globes, they were signing up to be the known prankster’s newest targets. Last night, Matt Damon AKA The Garbage Man told Letterman about involuntarily getting thrown in the middle of the situation and read a threatening letter signed by “grown-ass professional comedians†Fey and Poehler.