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In the prehistoric world of 35,000 BC, two neighboring tribes live in stark contrast: the Clean Hair tribe, who possess the secret to shampoo, and the Dirty Hair tribe, who live in squalor. The narrative centers on the Clean Hair tribe, led by their aging chief and his dim-witted assistant, Pierre. Their peaceful, albeit primitive, existence is shattered by the world’s first-ever murder—a shocking event that plunges the tribe into chaos. This unprecedented crime forces the tribe to develop rudimentary investigative techniques, as they attempt to identify a killer among them.The plot thickens with the arrival of a mysterious stranger who brings the promise of forbidden knowledge, while tribal tensions rise over the coveted, life-altering substance known as shampoo. As the investigation unfolds, the tribe grapples with internal power struggles, absurd social hierarchies, and the incompetence of their leaders. Pierre, desperately trying to prove his worth, finds himself at the center of a slapstick-filled detective mission that involves interrogating eccentric tribal members and navigating the bizarre cultural norms of their stone-age society.The dramatic stakes escalate when it is revealed that the murder is linked to a clandestine plot by the Dirty Hair tribe to steal the secret formula for cleanliness. The protagonist must reconcile his desire for tribal unity with the urgent need to protect their most valuable resource. Throughout the journey, the film satirizes modern societal tropes by projecting them onto a pre-civilization backdrop, where everything from the invention of the wheel to the discovery of fire is treated with frantic, high-stakes intensity. The climax sees a chaotic confrontation between the two tribes, where the fate of hygiene—and the tribe's survival—hangs in the balance. Ultimately, the story is a humorous exploration of human ambition, the absurdity of justice, and the lengths to which people will go for a good hair day. As the dust settles on the prehistoric landscape, the tribe learns that while murder may be the first crime, the struggle for status and identity is the eternal human condition. Through a series of misunderstandings and escalating absurdity, the film concludes with a realization that their primitive world is not so different from the modern one they unknowingly foreshadow.