Elaborate cat toys are great, not just because they entertain your cat. More often than not, they're designed not to entertain but to whip your cat into a frenzy, making it more entertaining for you than it is for your poor feline. Which is exactly what the Fling-Ama-String will do.

The Fling-Ama-String hooks onto any doorknob and does its own thing. Once you load it up with batteries, it'll make a string dance and flail about wildly, getting your cat to absolutely flip out, as cats are wont to do when string is being flapped about. Sounds pretty entertaining to me. Sure, it might drive your cat completely insane, but that's your cat's problem.

Via Random Good Stuff