Why does my arm hurt?

Wow last night was cuh-razy. Went w/ my two friends who are dating to a rugby formal. Moron decides he's bringing his ex-girlfriend b/c he feels sorry for her. Too much to drink, trying to help my two friends cooperate w/ each other, being told to watch Joe, being told to leave him alone. I don't care what he does...jeez. He is a professional at being drunk as far as i'm concerned. Lots of people, too much to drink, lol, door closed on forehead...now there's a bump. Watched ex-girlfriend's friend (complicated yet? well her name is Samantha) lost my train of thought...oh, watched Samantha make out w/ at least 3 guys. Gained lots of respect for one of them who stopped himself. Told him i respected him myself. Got told I was unique and cool and to watch out for Joe...grrr. Stayed the night and woke up to a house that was like utterly destroyed. Damn rugby players. My head hurts. My arm hurts. My toes are stubbed and there are bruises on my legs that didn't come from basketball. I think I'll stay sober more often. Haha.