A father and his son are driving down the road. The car collides with a tree and the father is killed. The boy is rushed to the nearest hospital where he is prepared for emergency surgery. On entering the surgery suite, the surgeon says, "I can't operate on this boy. He's my son."

Spot the error.

This statement can't be true if since the father is already dead, right?

No. You are the error. The error itself. You assumed the surgeon was a male.