...because good is dumb.
You know, kids, they sell these things at the flippin' bookstore, now, complete with genuine sound effects. Sixty-five quid ($90 American) will set you up in nerdvana for hours. Or you could do what we used to do when we were kids: duel with two wiffle bats and make your own sound effects.
At the very least, they could have watched the safety video.
(Wing-tip to NRO, the Corner, for the original link.)