For Monty Hall:You can run the experiment yourself if you want. Take three playing cards, say 1 Queen and 2 Aces, and a friend.
Take turns being Monty Hall(you get real insight being him), or the contestant. Record the results.
I had my little brother do this with his pokemon cards and some friends of his and it was amazing how close to 2/3 of the time "Switching" was the correct strategy was (The little kids seemed to love playing the game).