A doctor is standing in the hall of a hospital talking with a colleague when suddenly one of his patients runs down the hall in his hospital gown screaming at the top of his lungs.
Right behind the patient is a nurse carrying a pan of steaming, boiling-hot water, obviously chasing the patient.
The doctor interrupts his conversation with his colleague and shouts to the chasing nurse, “Miss Jones, I said ‘Prick his boil!'”