If you've used the old Unix/X-Windows "xeyes" application, you'll know what this app does.
If you haven't then all you need to know is that it will display two eyes on your desktop that will follow you mouse's every move.
You can make if full screen by pressing [Command][F], and you also get out of full-screen mode using that same keystroke.
You can move the eyes anywhere on your screen. Just click one of the eyes and drag it to wherever you want them.
Requirements:
ยท Java 1.6.u10 or later