You've seen these before in some form or another, but here's a new one I came accross on Digg.
Stare at the white mark in the middle of this picture for about thirty seconds then look away and blink rapidly or, and I prefer this method because it's more "impressive," close your eyes and stare into the darkness of your eyelids and wait about 10 seconds. Another option, and maybe this is the best one, is to then immediately stare at a blank, white or light colored wall.
Of course what is happening is that as you stare at a picute like this for an extended period of time, it leaves a temporary impression of some sort (I forgot what kind though; anyone know?) upon your retina (?) and when you look away, you can still see the bright parts of the image.
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