A guy in the locker room saw another guy with a piece of cork up his ass.
“Why do you have a cork up your ass?”
“Well, it’s a long story. But one day I was walking on the beach and I tripped over a bottle and woke up a genie who said he would grant me one wish. I said, ‘No shit!”
This joke is included in the Black Book of Jokes. You can order it from here.