30. The Automatic Tooth Brush Hat
Because apparently brushing your teeth with your hands was too basic, this 1950s contraption placed a motorized toothbrush on a helmet. Wearers strapped it on, bit down on the brush, and let the rotating hat “do the work.” Sounds fun… in theory.
In practice, the hat wobbled, the brush rarely hit the right angle, and many users drooled all over themselves. A slight head tilt sent the brush scraping across your cheek. Dentists called it a “gimmick with gum damage potential.” History agreed—and filed it under “what were they thinking?”
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