Brain teasers and real life just don't work the same way. The trick is to distinguish them.
If a bridge can only support 2 people, maybe it is better to not cross it at all. If you do have to cross it, maybe you can trust your tamed tiger with the goat. Pirates aren't rational agents that use silly rules for sharing the treasure. An egg that doesn't take a scratch when falling from the 13'th floor belongs to wonderland. Few women would kill their cheating husband right away. Fewer still would rely on the perfect rationality of others, and the mayor's to do so.
And so on. Brain teasers are fun, but many people (not just Richard Feynman) don't accept their weird assumptions right away, and instead assume a real-life setting.
If a bridge can only support 2 people, maybe it is better to not cross it at all. If you do have to cross it, maybe you can trust your tamed tiger with the goat. Pirates aren't rational agents that use silly rules for sharing the treasure. An egg that doesn't take a scratch when falling from the 13'th floor belongs to wonderland. Few women would kill their cheating husband right away. Fewer still would rely on the perfect rationality of others, and the mayor's to do so.
And so on. Brain teasers are fun, but many people (not just Richard Feynman) don't accept their weird assumptions right away, and instead assume a real-life setting.