The first dog I had was owned by an abusive couple. He was very skittish. He wouldn't let me hold him. It was explained to me that it was because of how he was treated.
My biggest pet peeve are just girls who go to sports bars who have no intention on caring what teams are playing, like they're looking for just a night out. That drives me more crazy than anything else. Like, don't pretend to be a sports fan.