Groove Stick
There are some gadgets, tools, and inventions that are so well-engineered that they need not be iterated upon, like the drumstick. The Groove Stick is a two-pronged attempt at streamlining the drumming experience by allowing a musician to hit the hi-hat symbol twice as fast using both sides of the V-shaped tool. A great idea in theory, horribly impractical in practice. You could repurpose it as a slingshot, though.
