Via “Justin Leiber”:http://www.hfac.uh.edu/phil/leiber/jleiber.htm, here’s “a playable version”:http://math.ucsd.edu/~crypto/Monty/monty.html of the “Monty Hall Problem”:http://math.ucsd.edu/~crypto/Monty/montybg.html. It’s simultaneously a lesson in decision theory and in the perils of small sample sizes – my first two plays I lost the car by switching.