The Monty Hall problem hits research into cognitive dissonance. That article had a link to a vintage New York Times article from around the time of the Marilyn vos Savant controversy, where Monty Hall himself tried to settle the matter. Really emphasizes Hall's role on "Let's Make a Deal" as a skillful huckster. There's a documentary, Deal, with a behind-the-scenes look at "Let's Make a Deal." Not all that great a documentary, overall, but seeing all that Monty Hall had to juggle during a taping was impressive. And, as a part-owner of the show, every penny he avoided giving to a contestant was money in his pocket.