father and son were involved in a car accident.
The father was killed. He was pronounced dead at the scene of the accident.  His body was taken to a local morgue.
The son was seriously injured. He was taken by ambulance to a nearby hospital. He was immediately wheeled into an emergency operating theatre.
surgeon was called. Upon arrival, and seeing the patient, the attending surgeon exclaimed, “Oh my God.  It’s my son!
1.    If the father is dead, how can he be the surgeon?
2.    Perhaps it was the stepfather who was killed?
3.    What other possibilities are there?
Note: About 50% of people given this test, failed. It is likely that just as many in our emailing group will also fail this test.