I can think of dozens of uses for this device. Are you DMing and one of your players is mouthing off to you? A quick "Don't make me mad!" and the player will fall in line. How about if your kids are loudly arguing? "Sucka, quit your jibba jabba," and the problem's solved! Sounds like hours of fun to me!
I do find it interesting that even after the A-Team movie, they still use Mr. T as B.A. Baracus for this device. Sometimes, you just can't top the original!