Have a problem getting the kids to keep the refrigerator door shut? These cute little milk carton-shaped friends from Japan may be just what you need. Starting out with a friendly greeting when you open the fridge, they quickly turn on you if you keep the door open too long (see a video of them in action here). Available in your choice of cold weather animals (penguin, walrus, seal and polar bear) for $15.99 at ThinkGeek.