I have heard of an interesting game that produces a very counter-intuitive result. It is an auction of a 100 dollar bill, but one in which both the first person in the auction and the second need to pay for the bill (while only the first one gets the bill). What is the most interesting, most often the bill is sold for over 100 USD, sometimes going up to 500 USD. The explanation is that the second-highest bidder doesn't want to lose a lot of money, so they opt to outbid the highest bidder by a bit to minimize their losses.
So my question is, what other game theory games are out there that produce very counter-intuitive results?
These are some standard ones:
Guess 2/3 of the average
Centipede game
Tragedy of the commons
Or pick anything counter-intuitive from this list of games in game theory, which, perhaps surprisingly, doesn't include the Monty Hall problem and the Sleeping Beauty problem. That would be because these are usually interpreted as a decision-theoretic problems.
One class of interesting games, that definitely go beyond normal intuitions, is that of quantum games. Perhaps somebody knows a few good ones.