Some are matter of lacking common sense and courtesy - and others are just blatantly spiteful. I also hate the folks that pump their gas, leave the car at the pump, and then walk inside to go the bathroom and order food or grab a drink. Move the car away from the pump then go inside. I got stuck behind a lady in PA when there were 5-deep lines at the pump. We all looked at her like "what the hell are you doing??"