At coffee and at the barber's I asked the one about the barber who shaved all the men in town who didn't shave themselves. Who shaved the barber? My barber answered, "the barber". The usual response is that it is a contradiction; I've long held that the barber is a woman.
My barber replied with a man and his son were in a car crash. The father was killed but the son was rushed to the hospital. The doctor walked out of the operating room and said, "I can't operate; the patient is my son." Who is the boy's father. I replied, "The doctor is the boy's mother."
I told this to my wife when I got home, and she puzzled over an answer.
