A guy goes golfing with his girlfriend. As he tees off, she steps into ladies' teebox and gets hit in the head with his drive. She is pronounced D.O.A. and taken to the morgue.
The coroner calls him in and says, "She definitely died from a blow to the head caused by the golf ball. But the only thing we can't understand is why was there a golf ball in her rectum?"

"Oh," he replies, "that must have been my mulligan."