Keystone Kops
One of the Keystone Kops movies was A Thief Catcher, made in 1914. That movie was lost for a long time. In 2010, it was found at an antique sale in Michigan. Charlie Chaplin has a small role in it as a Keystone Kop. Before the movie was found, people didn't know that Charlie Chaplin had played a Keystone Cop.