National Lampoon's The Stoned Aged

No one actually expects a watchable film from anything slapped with this franchise label anymore, and this is no exception. Meek caveman Ishbo (Rifkin) tries to persuade his tribe to evolve (using tools and stuff) but they're not big on his radical ideas. And while Ishbo is angsting over his dream cavegirl Fardart (Larter), his big, dumb older brother Thudnik (MacArthur) just clubs the chick on the head and drags her back to the cave.