I like to people watch. I sit at a restaurant and quietly watch people interact. I am just interested in people. :)
That's funny.  I do the same thing!  I love wondering what people are doing or where they come from!
I hate to admit it but I also like to eavesdrop. lol
Sometimes it is hard to stop listening when someone is saying something interesting to someone else.  I have been there and done that!
Yeah for some people watching is a hobby but for most it is just a subconscious activity that they do everyday.