Have you been naughty or nice this year? Wieden & Kennedy's London agency window has built a fun "machine" that can tell. As you walk by, it "scans" your whole body and reveals whether or not you're worthy of Santa's largesse. Not only that, you also get a printed report from the "North Pole Intelligence Agency."
If you're not in Hanbury Street, Shoreditch, you can play an online version -- it'll give you a quick calculation based on stuff like smiling at the cleaner, ate fruit for pudding, took the biggest slide of pizza or jumped a queue.