I mess with my grandkids by handing them one of my M4's with ONE round in the chamber, and an empty magazine. You oughta see some of the gyrations they go through trying to make it go bang again.......eventually, they remember that Grampa taught them how to clear and recover from a weapon malfunction, AND, trigger control and economy. I think they're somehow disappointed that it only took one shot to accomplish the task and still have 29 rounds left in the magazine, have to safe it and look for the next target.
Better to hit 30 targets once, than dump a 30 rounder and not touch one.