Answer:
They are toothy nocturnal immortals.
What always comes into the house through the keyhole?
If you drive on this, pedestrians and the police will be pretty upset with you.
I make billions of dollars selling Windows. Who am I?
Blue lives in the blue house, Mr. Pink lives in the pink house, and Mr. Brown lives in the brown house. Who lives in the white house?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?