Usually looking at people, critiquing outfits, hairdos, whatever. Checking out good looking guys. At the Silverdome as a kid I used to daydream about being a fly and buzzing all around the stadium, weird I know. When I was a kid, and we caught a ride with one particular sister I made sure to remember at least one thing, because we always had to say one thing that we got out of it everyday, then we could turn on the radio and relax.
When I went to the DC last year, there was a young couple sitting a couple of rows ahead of me, since I was seated higher I could see they were playing tic-tac-toe. I thought that was hilarious.
I mentioned it before on another thread that a couple of years ago at the DC my mom just pulled a novel out of her bag in the middle of a talk and started reading it.