One trick involves a powered nail gun with a quantity of missing nails from the series of nails in its magazine. Penn begins by firing several apparently real nails into a board in front of him. He then proceeds to fire the nail gun into the palm of his hand several times, while suffering no injuries. His pattern builds as he oscillates between firing blanks into his hand and firing nails into the board, and fires one blank into Teller's crotch. Near the end of the trick, he says that it is a trick and that he and Teller believe that it is morally wrong to do things on stage that are really dangerous—it makes the audience complicit in unnecessary human risk.