I've been a little obsessed with Psapp's Hi for a while now. It's part of a little mini-genre called clunktronica, which employs all sorts of bits and bobs in the creation of fantastic rhythm. It's so catchy it's almost sinful.
Bonus: gather all your pets in one room, play "About Fun," and watch them all eye one another suspiciously, like "who's making that noise? Is that you??"