I do the same thing when I'm sitting around in waiting rooms, and sometimes I'll even say "hello" or "how are you?"

People lament the absence of spontaneous conversation in their lives, but they don't realize that it's because they don't ever make eye contact with anyone else around them. There are tons of people everywhere who love to chat in line, or waiting for a bus, or sitting in waiting rooms. It's how we used to pass time before we bought a black mirror to entertain ourselves.