Harold Ramis' caveman comedy Year One invites the audience to "meet your ancestors." Well, it's a safe bet that any species descended from Jack Black (Zed) and Michael Cera (Oh) would possess highly developed joke-cracking skills. Call it survival of the funniest. But not all primitive men are created equal, on screen or off. (Does anyone really think a hirsute Ringo Starr stands a chance against a fur-bikini-clad Raquel Welsh?) This list sifts through the movie fossils -- some recent, some a bit dustier -- as it rates the top ten caveman in movie history.