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NEW YORK, NY - JULY 4: Hot dogs are seen before the annual Hot Dog Eating Contest at Coney Island July 4, 2016 in New York City. Joey Chestnut re-took the crown, eating 70 hot dogs and beating last year's winner Matt Stonie's 53 hot dogs consumed. (Photo by Eric Thayer/Getty Images)

From glue sticks filled with butter to shoes with a built-in air conditioning system, we count 20 of the most bizarre and utterly useless inventions some people actually believed might take off in mainstream culture.