Prehistoric Pink

The Pink Panther and a short, pointy-nosed caveman are laboring to move a large, rectangular slab of rock across a prehistoric jungle. The Pink Panther realizes that the rock would be easier to move if it were round. So, he and the caveman chisel it into a sphere and roll it down a hill. It picks up speed and flattens the caveman repeatedly as it reaches hill bottom, rises on another hill, then re-descends, again and again. (imdb)