It's a pet peeve of mine when people talk to me while I'm in the bathroom. I just don't like carrying a conversation and pooping at the same time. It's even more annoying when I'm in the shower because both me and whoever is trying to talk to me have to go WHAT? after every sentence. It doesn't even have to be a conversation really. If the bathroom door is closed and I am in it, don't talk to me. It just feels like you're there in the bathroom with me and that's just plain weird. Luckily it hasn't happened since I lived with my parents. I'm slightly more comfortable with conversation in public restrooms.
Discuss bathroom annoyances! (teehee)