Take two nomal people, Add money to just one of them, and watch what happens.

Science can explain a lot of things that I've always wondered about (go, science!). In this case, it explains what I've known for a long time but been unable to quite understand: Why do some folks who have a lot more money than others seem to be less nice and more evil to everyone around them? At 0:50, someone actually takes candy from babies. No, really. At 3:00, we start to see the science unfold before our eyes. Entire management courses could — and should — be taught with the bit starting at 4:40.

http://www.whydontyoutrythis.com/2013/07/take-two-normal-people-add-money-to-just-one-of-them-and-watch-what-happens-next.html