A father and son are in a car accident, and the father is killed instantly. The injured son is rushed to the emergency room, but the head surgeon says, “I can’t operate on this boy, because he’s my son.”

How can this be? Who is the surgeon?

See what people answered 30 years ago, and what elementary school students are answering today, in this fun but thought-provoking piece from ABC News. (Sorry, the video doesn’t seem embeddable.)

(Thanks, Ron.)