Count the number of passes between the people wearing white shirts.

I know this is an old video but it is a particular interesting example of how we to often only see what we want to see. I originally saw it as presented by Micheal Shermer in this TED talk where it was introduced particularly well. In his introduction he first explaining that when you watch this video you should count the number of times the basketball is pasted between the people wearing white t-shirts. He then said that you should be very careful in counting since the number you get tells you something about yourself. Additionally he explained that, interestingly, men and women get different results. Unfortunately, this segment has since been (don't follow this second link until you have seen the basketball video) removed from the talk. The talk is still well worth watching but his introduction has I think been totally removed. The basketball passing video can be found here. Remember to pay careful attention to counting the number of passes between the people wearing the white t-shirts. After that watch it again but pay attention to those in the black shirts and maybe you will understand how it all fits together.