Unidentified Drinking Injury

How did this happen ? I dont recall banging my head, so I can only assume it was a UDI after dinner at Annah's on Saturday. It took 3 days to notice that I had a 5cm cut on my head, but I have had a bad headache for those 3 days. Perhaps I was abducted by Aliens who took away part of my brain... I should fit in well around here now.