You rarely see a cat walking outside of the house with an adult human being, and it can be safely said that no teenager in his or her right mind wants to be seen in public with his or her parents. Even if you tell jokes as well as Jay Leno, neither your cat nor your teen will ever crack a smile. No cat or teenager shares your taste in music. Cats and teenagers can lie on the living-room sofa for hours on end without moving, barely breathing. Cats have nine lives.
Teenagers carry on as if they did.
Cats and teenagers do not improve anyone's furniture. Cats that are free to roam outside sometimes have been known to return in the middle of the night to deposit a dead animal in your bedroom. Teenagers are not above that sort of behavior.