Amazing Psychological Experiment

I really can't say much about this video before you watch it. Just make sure you watch it until the end. The video shows six kids playing basketball, three of them are wearing white t-shirts and the other three are wearing black ones. You're supposed to count exactly how many times the players wearing white shirts pass the ball to one another. This is much trickier than it sounds, and I guarantee it's definitely worth your time!

The phenomenon illustrated in this video is referred to as inattentional blindness, which is related to the subject of change blindness. For more info, see this article in the Scientific American magazine.
If you liked the video, you may also like to take a look at the amazing color changing card trick video, made by Richard Wiseman, and perhaps visit his quirkology website.
Last but not least, check out this previous post ("Seeing is believing; or is it?") for some really cool optical illusions.