Subway Reading

With so many people reading on electronic devices like Kindles and iPads, I can't be nosy and see what my fellow subway riders are reading. I like to see what books other people are reading. The reading habits of others make me wonder about what kind of person the reader may be. For example, was the guy I saw reading The Infinite Jest tonight on the subway a David Foster Wallace fan or just a poseur who wanted to impress others with his highbrow reading selection?