Fans of Matt Damon know that the actor is passionate about humanitarianism. So it's wasn't a stretch to see him playing himself on the season finale of HBO's Entourage, enlisting Vince (Adrian Grenier) to work for one of his charitable causes. Of course, Entourage has a rich history of actors playing unhinged versions of themselves. (Remember Bob Saget as Vince's womanizing, expletive-spouting neighbor?) And yet it was still funny to watch Damon fall apart in a series of calls to Vince about donating to a certain foundation. "I can't believe I have a [expletive] Academy Award, and I'm calling you back again and again and again, you [expletive]," he shouts into the phone, before dissolving into shoulder-heaving sobs. Bono and LeBron James also made cameos in this episode, but Damon's meltdown stole the show.