Gogs (1995)

Grungy, in-your-face claymation comedy about a family of cavemen in prehistorical times, as they struggle to survive in a dangerous world, armed only with their wits - or half of them, anyway. The characters are seen involved in awkward, uncomfortable or plain stupid activities. Grandpa's solution to everything is to hit it on the head with his club; Mother has no idea how to look after her baby; and they all indulge in bodily functions in public. Watch them as they fight dinosaurs, discover fire and lose it again immediately, and, of course, hit each other on the head with clubs.