Bathroom talk

I'm all for being a friendly guy and all, but why do people insist on giving me a smile when I pass them on the way to the bathroom at work. This isn't a bar, there doesn't need to be any chit chat or small talk. Do they know something I don't. My fly is up, I didn't wet myself. I just don't get it.

I think in retaliation I am going to be leaving the seat up at all time and opening the window, which faces across from another building.