I have five children, and they mostly look alike — except for my 8-year-old son, who has slightly different features and a more husky body composition.  He has a twin sister, so we consider him the bonus baby.

One day, I happened to watch him getting dressed for school.  To put on his pants, he laid down on the floor and pushed his legs through the pants simultaneously.

This proves he is special.  Unlike most men, he DOES NOT put his pants on one leg at a time.