TMI Alert. Read on at your own risk.
I hate it when I go into the bathroom at work to take a crap and someone else comes in when I am halfway through, so I have to wait until she leaves before I can finish, but she is waiting until I leave, and I don't want to just sit there in silence, waiting and waiting when it is that mean bitch who should leave since I was there first. Poop etiquette dictates that she should stop after the pee and come back later when the bathroom is unoccupied.