RRRrrrr!!! (2004)5.9 /10

Storyline:  In 35,000 BC, two Stone Age tribes—the Clean Hairs and the Dirty Hairs—are in conflict over the secret of shampoo. The Dirty Hair chief sends his daughter Guy to infiltrate the rival tribe and steal the formula. But when two Clean Hair members are murdered, their leaders launch what becomes the first criminal investigation in human history.