Year One was complete crap. The only time it was "funny" was when it was poking some fun at Biblical stories (Abraham's remarking that the circumcision look was "really going to catch on" was the funniest line in the whole movie) but most of the rest of the time was just really stupid, low brow, scat humor and "look at the flamboyantly gay Sodomites!" humor.
Blech. That movie was just pure shit.