Squigly Squigly's Brain Teasers

Question:

A rooster lays an egg on the top of the roof. Which way does it roll?

Answer:

Roosters don’t lay eggs.

Try another Brain Teaser:

A boy was rushed to the hospital emergency room. The ER doctor saw the boy and said, "I cannot operate on this boy. He is my son." But the doctor was not the boy's father. How could that be?