Stone Age Romeos (1955)

"The Stooges are told they will be paid $50,000 if they find evidence that cavemen existed."

The stooges hope to collect a reward by proving to a museum that cavemen still exist. They return from their expedition with a film purporting to show some stone age stooges defending their women from other cavemen. The museum curators are about to pay they reward, until they overhear the stooges talking about how they faked the film, with themselves playing the cavemen.