I've seen a lot of optical illusions in my day. By now, I more or less respond to them with a hearty "meh." But there is one never fails to mess with my mind. As much as I try, I simply cannot trick my eyes into seeing those squares as the same color. Can you? In case you don't believe that "A" and "B" are the same, hover your mouse over the image and you'll get a little help.
Crazy, huh?
I refuse to believe this. I must have rolled my mouse over it fifteen times. I think someone is tricking us.