Don't view the video until afterward as it's a spoiler.

Go here:

http://www.grand-illusions.com/opticalillusions/dragon_illusion/

Print out the image and carefully follow the instructions. It'll take you a few mintues to assemble, but it's totally worth your time. You'll need scissors or an Xacto knife, and a little tape.

While looking it in the eye worked, I got better results looking at the lower nostril initially.

I've seen the video before but not the print out thing. Very cool.

Nii!

And wow.

Oooooh, that's really nice... but kinda creepy in the dark in the middle of the night.

Fortunately I'm unable to see it in the dark in the middle of the night. ;P

Oh, really? I thought everybody had night vision. Oh, well