In the episode where Lewis and Oswald are making a "Scary Halloween Noises" tape recording,Oswald starts stabbing a ham(which is sitting on Drew's table)with a big kitchen knife.Then Drew and Kate walk in and Drew screams,"My ham!".So Oswald sits down,and leaves the knife in the ham.Then the camera cuts away to show Drew and Kate sitting down(at the table).Notice how the knife has mysteriously moved,and is now just lying next to the ham.