Sports is fun to watch for the same reason watching any other form of skilled competition can be fun.
Identifying with a far removed team is a way to join a tribe, and get all the fun results thereof. It doesn't matter that much that you're identifying with a bunch of players who are hired by an organization that is nominally affiliated with a location far away from you. People subscribe to really tenuous group membership all the time: they feel affiliated with faraway centers of government, ideologies that have no geographic location, etc. What does matter is being able to find people, preferably nearby and in person, you can signal your group affiliation to.
In Germany the sport of choice is soccer. From time to time I notice how people (a) put in serious effort to watch the game on TV, and (b) complain about how bad it was afterwards. Some regularly complain about how bad the sport has become, but still eagerly watch it again next time. For me it looks like a weird tribal ritual, thats just stupid.
The other day, someone did something I didn't expect. It was something many people have done before; something that I thought of as very normal, but that I in no way understood and had not predicted.
As I said, this had happened many time before, so I wrote it off as "me not understanding people" or "people are weird" for a second, like I usually do, before realizing that "bad at" really means "lacking basic knowledge", which I had never realized before.
And then I thought "I should ask someone who is different from me why people do that, and eventually someone will have an answer."
But many people will have many more questions like this. So, what have you observed people doing time and time again, but never understood? Or something that you only understood after a long time or asking someone about it?
And can Less Wrong tell us, not necessarily why (I for one can make up evolutionary psychology fairy tales all day if I want) but what conscious thought process occurs behind these events?