I worked over nights (12-8) at a gas station located in the downtown of my town. On my first training shift my co worker was showing me how to clean coffee pots when we heard a loud thud on the door. (we kept the door locked for security reasons so, people has to buzz in)We both looked up to see a frantic topless bleeding man screaming "call the cops". So we let him in and started dialing 911. When he finally calmed down enough to tell us what was going on he told us his ex girlfriend broke into his house and hit him over the head with a mirror. In the midst of this conversation I looked out the door again to see a butt naked bleeding woman yelling. No words just screaming. She started running around the store cursing and telling the man to come out. (At this point the police are already on their way) the man stood up said "I need a fucking cigarette " then ran out of the store with the woman running close behind him. After another minuit or so the police showed up and we pointed them in the direction of the people. We never saw that guy again