I also hate the moments when:
a) you have your RP post and you're ready to post, but then your friend comes in and posts something that makes the content of your post irrelevant. Then, you have to erase EVERYTHING and write a new post. Repeat cycle.
b) when you're writing a perfect post and your friends start asking "Is she afk?" GLOB, I'm trying to write a post, don't make me erase it and have to reply to you. >:C Then, repeat with (a)!