I remember an episode of COPS some time ago; a guy was chucking his used tires into someone else's dumpster at night when a guy tried to rob him at gunpoint. The victim used the old "Holy crap, what's that?" and when the robber turned the victim laid him out with a haymaker.
Here's the stupid criminal thing: The robber flagged down a cop to complain. The victim said "Yep, I hit him". Cops walked over to where it happened and there's this guy's molar laying in the dark parking lot.
Robber went to jail, the victim was counceled about theft of services by using someone else's dumpster and was let go.
Cops laughed at the stupid robber all the way downtown....

