Keystone Cop

== English == === Etymology === From the Keystone Cops, a group of fictional, humorously incompetent policemen featured in silent slapstick comedies produced by the Keystone Film Company (itself named for the "Keystone State": Pennsylvania) between 1912 and 1917. === Noun === Keystone Cop (plural Keystone Cops) (informal) A bungling, incompetent policeman. ==== Alternative forms ==== Keystone Kop