In my fantasy world I have invented a speaker death ray that follows the sound to the speaker and blows them to smithereens. I also see the look on the jerk's face.
There are some firearms that are very clear on which end you should be on and which end you should not be on. A Mossberg 500 with a full heat shield, pistol grips fore and aft, multiple shells affixed to the grips and along the magazine, and a laser sight merely adds to the effect.