The Flintstones turns 50: The five dumbest moments

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2. The Pebbles and Bamm-Bamm Show

They grow up so fast.

Hungry for another hit, Hanna Barbera greenlit several Flintstones spin-off shows.

The most curious was 1971's The Pebbles and Bamm-Bamm Show, which recast the prehistoric pair as teenagers. Mercifully, these misadventures at Bedrock High School only lasted one season.

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