Matt Damon has accomplished much in his illustrious acting career, including Oscar nominations, an action movie franchise, and this weekend's release of Hereafter, but one of my favorite performances of his couldn't be more lowbrow. It's his cameo in the raunchy comedy Eurotrip, where he unexpectedly pops up as the lead singer in a band, complete with a shaved head and neck tattoo. His character Donny sings "Scotty Doesn't Know" (really performed by the band Lustra) while Smallville's Kristin Kreuk grinds alongside him. It's easily the best part of a pretty bad movie — and if you're wondering why Damon agreed to do it, it turns out that he went to college with the directors. If that doesn't make you love him more, then watching him stick out his tongue and dedicate a song to "the nastiest, freakiest little sex puppet I know" will.