I am still getting feedback from the National Geographic Show Brain Games that I was on! It was a ton of fun and if you watched the entire show you surely saw some mind bending videos.
There was one that really freaked me out by making you think you were looking at two different shades of gray but in reality it was the same shade of gray separated by a shadow. Really really fun and weird stuff. Check out this photo
It looks like two different colors right!? HA that is what I thought too! Now put your hand over the center where it seems to bend. Put your arm across this spot and you will see you are actually looking at the same color it is just an illusion! CRAZY!!! This was one of the first things you saw on the National Geographic Channel show Brain Games. They opened up with this.
Or how about this video where they jacked with your mind a little more on attention span