Ever since the industrialization of the automobile, countless backyard inventors and opportunists who were "good with tools" have tried to improve on carmakers' products. Sometimes they succeed (windshield wipers), but often they fail. What's the dumbest car invention ever?

Remember that fifth-wheel-for-parallel parking thing? Back in the 1950s, someone made the brilliant observation that parallel parking was a huge pain in the ass. He went back to his shed, somewhere on the Marshall Islands or wherever, and came up with a pivot system using a retractable fifth wheel. It seemed like a good idea, until people didn't particularly give a shit. And it made doing parking-lot donuts really, really boring.

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