Hah...it's really a quite "simple" IQ test just heard from one of my friend. Have a guess and Enjoy! 
IQ test:
Tommy (father) and Jerry (son) went out for a walk, a truck lose
control and bang on them. BANG! Both of them were sent to hospital but
only the son Jerry survived and Tommy is dead. One of the doctors come
and inspect Jerry, when enter the room, the doctor cried and said “Oh!
That’s my son!"
Now the question is: What is the relationship between the doctor and Jerry? Drop your answer in the comment.
Note: Here are the common answers: They said the doctor is “Jerry’s
godfather/stepfather/grandfather”, God, Tommy revive, angel. Alright,
they are all wrong.
Any ideas? 
Hah...be free to share with me! XD