My Monty Holt Paradox Machine
Some gameshows ask contestants to choose between three doors hiding one prize. After the initial choice, one empty door is opened and the contestant asked whether they would like to stick with their choice or to switch. Theoretically you have better odds of winning if you switch, although psychologically contestants want to stick. Now you can test each strategy and see how your score goes.
Inspired by Mythbusters' show on the Monty Holt Paradox