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This is the game show where you've got three doors and prizes behind the three doors and the contestant has to pick a door. And then Monty Hall is a host, opens one of the doors and it's always one of the doors that has one of the good prizes. And so he says, now you know what's behind this one door, you have a choice. You can either keep the door you've got or you can move to the other door. And the question is from a probability standpoint, is the contestant better off keeping the door he's got or going switching to the other door? And the answer to that is very counterintuitive and you can read, there's a fair number of explanations of this problem that you can read. But that is the big brother to the problem of the normal person.