Obviously, whether that's how you choose your book or not, reading in public automatically brings to question how your reading in public appears to others, and what you're reading can impact that impression. For example, I read poetry. I like to read poetry, but I have no doubt that the people who see me reading on the bus think I'm pompous, or that I think that I'm better than they are, or that I must be smart. (I have felt this way, except for the smart part, about somebody I saw reading Dylan Thomas aloud in a coffee shop. I also thought they were an idiot b/c they were clearly doing it to make other people think that he was cool & smart. But he wasn't.)
Idea: Reading (not aloud) in public as performance. Read in strange places where you normally wouldn't see somebody read. The floor of a public restroom. Under a table in a restaraunt. In one of those chairs at the bank, or grocery store. At a concert (I actually have a friend who does this. The reaction is phenomenal.) At a loud bar (I have done this. It was awkward. I left.) Someplace crazy. Read something crazy too. Or something ordinary.
It's on the level w/ wearing a fat suit & fake pimples and walking around town to see how different people would treat you if you were less attractive. Reading as sociological experiment. Fun.