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In the 1940s, toy inventor Eddie Goldfarb saw an ad for a false-teeth holder called a 'Tooth Garage' and he started cracking up. In his head, he saw a pair of dentures, chomping and sputtering down the road like a car, and parking on their own.
Thus, in 1949, Yakity-Yak Talking Teeth - the wildly popular wind-up gag commonly known as 'chattering teeth' - were born.
(thanks Lisa)The Presurfer