ok here is one from my friend. Kind of a strange one.
"A Boy is Fishing With the Doctor. They came there together at 5am. The Would leave at 9am. The Boy is the Doctor's Son. The Doctor has an appointment with his patient at 10:30. The Doctor is not the father of the boy. The Doctor Has to get home at 2pm sharp. How are the doctor and the Boy related."
take your time.