1. Keep your hand on your mouse throughout.
2. Download this file. DON'T RUN IT YET. When you run it, you'll see a swirling image. At the center of the swirling image will be a dot. Got it?
(NO, this isn't one of those freaky "sabotage" flash apps that scares the bejeezus out of you with a f--ked up picture.)
3. Now run it, and FOCUS ON THE CENTER DOT FOR 30 SECONDS.
4. Look down at your hand on the mouse.