There was a programme on TV called "America's dumbest criminals", I didn't see it (it was on sky or something else I don't have) but one of the crimes involved some bank robber who, having got a disapointing figure of money, got to his getaway to find that he had locked his keys inside it! Then apparently he tried to get in using his gun and managed to shoot himself in the leg (ricochet?). D'oh!