Don't talk about anything that should not be discussed publicly among strangers. If it's private, then go somewhere out of earshot. This may seem like common sense, but it's amazing how few people seem to exhibit this trait. I've heard about the cheating boyfriends, gyno visits, STDs, and love triangles of complete strangers while standing in line at Target. And after hearing them go on and on, I'd like for us to remain complete strangers.
