You start as an eskimo, jumping up blocks of ice, but then you start falling and eventually you turn into a werewolf and need to kill people or collect things. Think of it as a mini-game collection of the strangest things you've ever seen and you'll be on the right page of the weirdness manual. If you're confused, just watch the play through video below.
Controls are handled by Z and X and the arrow keys and they change contextually depending on which game section you're playing. There are few things that can cause a simultaneous "WTF?!" and "I want to keep playing this," but Keyboard Drumset Fucking Werewolf manages to do just that. You can think of it as playable music video if you like, since everything is keyed up to the music, or you can just let the insanity wash over you while you enjoy it.
It's a free download for Windows and Mac over on Cactus' site. Crank it up and give it a go for yourself.