The Zero Gravity Fridge Rover won't patrol for expired items, but it will help to keep the fridge door organized.
The clutter that collects on the refrigerator door is a visual representation of activity. Like a giant funnel, it collects bits and pieces of everyday life from kids' artwork to the grocery list, not to mention schedules, reminders, and easy-to-find notes left for loved ones (that can stay in place for months on end). This is a happy clutter, one that evolves over time. As with all evolution, things get lost, things get replaced, and sometimes things get up and walk away.
The Zero Gravity Fridge Rover from ThinkGeek isn't likely to escape the bounds of the refrigerator door (yet), but it will amuse with its gravity-defying act as it roams the landscape as if in search of life, trace minerals, or moldy cheese.
The clever car measures just 1.75 by 1.5 by 1.75 inches and sticks to the fridge just like any other magnet. Wind it up to set it in motion, and the little critter will roll about the door. The integrated magnet keeps it from falling to the floor; at least until that ultimate eventuality when the rover decides to set out on its own. When that time comes, hopefully it won't cajole all the other little magnets into spontaneous evolution; something needs to hold up the shopping list.