A patent filed, usually as a result of a bet between patent lawyers, that they can get the patent office to grant an obviously ludicrous patent. Well known examples are the obviously scatological Novelty Keyhole Finder, U.S. Patent No. 2,632,266 granted in 1950 for a fur lined keyhole, which allegedly resulted from a drunken bet (apparently the patent attorney involved was also disciplined by a red-faced USPTO which used to deny the patent’s existence); and US 6,368,227 B1 for a Method of Swinging on a Swing See Fake Patent.