A hubcap was a part of a wheel for a car.
In 1931, Marty threw a hubcap at Irving "Kid" Tannen and dislodged his gun, subsequently using it to shoot Doc Brown's shackles and escape from the paddywagon, saving Doc's life.
In 1986, Edna Strickland Tannen yelled at Tiff Tannen, who was messing with a hubcap outside her apartment.
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