You haven't cleaned the litterbox in what, two weeks now? It's all well and good that you've acclimated to the overwhelming stench of ammonia and kitty poop, but what about when guests come over? With some minor mods and a little electrical engineering, you can keep your home from smelling of feline by-products without actually having to be a responsible pet owner and clean up!
The Odorless Cat Litter Box by Instructibles submitter, Projectwriter, is reportedly cheap and simple to construct using easily-scavengable items. "This project costs less than £23 to make and can be prepared from affordable household's and recyclable objects. The design is perfect for flat dwellers," said Projectwriter. Then again, a slotted spoon will run you what — two, three quid? [Instructables via Hacked Gadgets]