Ok this one didnt work on me but it would be pretty cool if it did work:

Look at the center of the spiral (wait until its finished loading and is continuously spinning) for about one minute. Then look at the back of your hand


Photo Cred: http://www.optillusions.com/dp/1-42.htm
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The back of your hand should look like its twitching as if bugs were underneath it.

Find the baby in this picture:

Look at the black dots in the center of the photo for 60 seconds. Then, close your eyes and face a bright light (like a lamp or an open window). You will see a white circle with the face of Jesus inside of it.


Phot Cred: http://www.optillusions.com/dp/1-54.htm

OK Amiti found this one:
The moving dot is pink if you look directly at it, but is green if you stare at the black cross in the center

Look at the following picture and see if you can find anything unusual about it (Hint: does it spell anything?)

Photo Cred: http://www.coolopticalillusions.com/optical_illusions_images_2/liar_liar.htm
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Tilt your head to the right a bit to see the word "Liar"

How many legs does the elephant below have?

Photo Cred: http://www.optillusions.com/dp/1-3.htm

Photo Cred: http://www.optillusions.com/dp/1-35.htm

Squares A and B are actually the same shades of gray