Jack Black as a caveman, Michael Cera as his soft spoken sidekick; with a script written by the guy who brought us Animal House, Stripes, Caddyshack and Ghostbusters. That should be a formula for a pretty decent, off-the-wall comedy, wouldn’t you think? Well, sadly you would be wrong. Lately something has happened to the formula and all we get are comedies with an older audience rating but with humor that is on a 5th grade level. Sure films like Stripes and Animal House had moments of crudeness and sexual antics but there was an attempt to write something creative. This film has zero creativity and even less true humor. Mix that with thin characters and scenes that play like bad sketch comedy and you might as well toss Year One right on the garbage heap with Land of the Lost.