Do you love to tinker? Do you also love to harass your coworkers with an elaborate remotely-controlled turret? Have I got the project for you.
Trossen Robotics' turret kit allows you to build a controllable turret that can do any number of things, from give you a webcam for spying, a fan for keeping cool or, of course, a pellet gun with laser sight for making you the most annoying guy in the office.
You'll have to put the whole thing together and configure it to your specifications, but isn't that part of the fun?