You have no idea how many times I had to stack this =). Though the rubber ducky was safe on top of the house of cards. Most of those cards are actually photos mounted on cardboard sent to me by a good friend (who is reading this =)).
Man my desk is messy - I can spy a lot of various techno-cruft sprouting from the desk surface. The rubber ducky is actually schwag from some sql company .. "get your sql ducks in a row". It's a land-duck, it has never seen water .. if I had a bath tub it might have =)