Making Conversation in Public Restrooms

I really have come to no logical explanation of why this happens to me, but for awhile now I've noticed that women find it acceptable to talk to me while I am peeing. The more I think about this, the more it confuses me. I am not a very "friendly" person. That will probably be taken the wrong way. I mean that I do not go out of my way to make eye contact with people, smile at people, or talk to anyone unless I absolutely have to. When I happen to make eye contact with people, I feel like I have to give that weird ass half smile that seems to say, "this is absolutely painful to do because I have no idea who the fuck you are." (this smile never shows teeth... you KNOW what I'm talking about) Sometimes, this leads to a conversation of "How are you, today?". This could go one of two ways.