I love optical illusions. That first one reminds me of a Foxtrot cartoon I recently saw in the paper.
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Here's another good illusion.
"If your eyes follow the movement of the rotating pink dot, you will only see one color, pink. If you stare at the black + in the center, the moving dot turns to green. Now, concentrate on the black + in the center of the picture. After a short period of time, all the pink dots will slowly disappear, and you will only see a green dot rotating if you're lucky! It's amazing how our brain works. There really is no green dot, and the pink ones really don't disappear. This should be proof enough, we don't always see what we think we see."
-Mike
"Of course the car made it home, you're calling me at home."