If you have a cat you would like to keep occupied, then the new Egg gadget is just what you are looking for. Currently a kickstarter project, Egg says it is not a toy but a cat companion. The Egg is shaped like an egg but inside there is an offset motor, rechargeable batteries (through your USB phone charging cord), and you can configure different modes on your computer interface.
The Egg will move back and forth (even over carpet), shake, make sounds, sense obstacles and reverse direction, sense interactions with your cat or kitten and try to excape if your kitten/cat grabs it. There is still time to order yours. Funding period ends January 25, 2014.