For no good reason at all, the guys at Rathergood made a series of gas mask kazoos. All they need is one more member to make the scariest barbershop quartet ever assembled.
Here is an extremely annoying video illustrating the process:
Forget barbershop quartet. One more member and they will have the fourth horseman of the apocalypse. [Rathergood via Make via Boing Boing Gadgets]