Mouse Jiggler
Here's a USB device that can be both practical and amusing. In many larger businesses you'll find that the computers are set to lock after a certain period of inactivity. This can be annoying, especially if the IT department has set the timeout period to something short like 5 minutes. This will prevent your computer from ever thinking that you're away from it.
How does it accomplish this? By constantly moving your mouse, that's how. The cool thing is that they offer these in two speeds, one fast and one slow. The slow one is barely noticeable, while the fast one will jump around on your screen like crazy.
The slow one is more suited for everyday use, as it won't likely interfere with your work, while the fast one will wreak havoc on an unsuspecting co-worker. Just imagine their surprise when they sit down and realize their mouse won't quit jumping around. You can pick either one up for $29.95.
[via product page]