This ruby script demonstrates the apparently-absurd fact underlying the Monty Hall problem (http://en.wikipedia.org/wiki/Monty_Hall_problem). There are three doors. Two doors have a goat behind them. One door has a new car behind it. The contestant chooses a door. Monty Hall opens a second door, revealing a goat. The contestant must choose whether or not to switch between the two other doors. Running this yields: $ ruby goats.rb By not switching doors, you win 33335304 times out of 100000000. By switching doors, you win 66664697 times out of 100000000.