Mouse trap
Poor mouse, it had no idea what country it was in and what the rules of the game were. At any point in its life, a gun could go off and shoot it right in the face. How brutal of a way to kill a mouse, by dedicating a whole gun just for that single purpose.
Whoever thought about this was definitely a disturbed individual, no sane person would actually think this was a human thing to do. We wonder if this was even effective at the end of the day, mice can be very elusive if need be. Have you ever tried to catch one, it is almost impossible.