Torture Your Pets With Your Tiny Chopper
If you want to annoy the bejesus out of the person in the next cubicle, spy on your neighbor's sumptuous daughter with a micro-camera or just torture your pets (psychologically, please), you might want to check out the Wasp micro helicopter.

This tiny chopper (sorry) is a mere seven inches long, uses a tri-band control system, recharges via its transmitter, and comes with a spare tail propeller (in case the original gets eaten by your cat).
It's described as "suitable for indoor flying", so might not actually be much cop for spying on your neighbors, but then that's probably illegal anyway.
You can snap one up at Zsuaro for a poxy $35. You'll need to get your own batteries though.