Jack Black and Michael Cera as Cavemen!? | YEAR ONE: First 10 Minutes 

Watch the first 10 minutes of 2009's Year One movie, starring Jack Black and Michael Cera!
Watch the full movie:
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History was made...by these guys? Zed (Jack Black) and Oh (Michael Cera) are cavemen who stumble out of the mountains into an epic journey of biblical proportions. One’s a bumbling hunter, the other’s a gentle gatherer; together, they become unlikely participants in history’s most pivotal moments. Directed and co-written by comedy legend Harold Ramis (Groundhog Day, Caddyshack, Analyze This), YEAR ONE is rude, crude, wildly absurd, deliciously tasteless and laugh-out-loud funny!