I hang a target at 15 yards and give them 5 rounds to be fired in 30 seconds. I then sit 10 tacos on a plate, 5 for them and 5 for me. For every round that they miss, I eat one of their tacos. If they miss all 5 and don't get a taco, no matter how angry they become, I laugh while eating all of their tacos. What are they going to do at that point, shoot me?