Somebody who knows how to play the accordion, but doesn't. Kindling for an accordion fire. The Uzi stops after 20 rounds. Learning how to fold a map. Ladies in Pain.
Terrorists have sympathisers.
Get them to play by themselves. It saves a lot of time. They are used to playing both ends off against the middle. There is always a huge sigh of relief when the case is closed. The lead singer can tell he is playing wrong notes.