Elevators & Strangers

I am up and down on the elevator a lot when I am at work. At least once a day I get some perfect stranger trying to have a conversation with me. I think people think they are being nice by talking to you in the elevators. I cant stand it! If I don't know the person usually I will pull out my cell phone or stare forward after the obligatory smile at whoever just came in to the elevator. I don't get why they have to comment about the weather or how its almost time to go home, or how the elevators are running slow that day. Why cant they just be quiet?? I really don't get it, maybe I am just donut have good elevator etiquette but I don't think this is going to change. Oh and the farting in the elevator inexcusable!