There was once a little girl and a little boy in kindergarten.
One day, the little boy pulled down his pants and asked the little girl, "what's this?"
"I don't know," the little girl replied, pulling down her pants and asking him the same question.
"I don't know," said the little boy.

The little girl goes home and asks her mother. She pulls down her pants and says, "mommy, what is this?"
"That's your garage, honey' the mother said, "don't let anyone park their car in it."

The little boy goes home and asks his father.
"What is this, daddy?"
"That's your car, son" he said, "park it in as many garages as you can."

The next day the little girl walks home to her mother with hands covered in blood.
"What happened?!" asked the mother.
"Well," said the little girl, "some boy tried to park his car in my garage, so I tore off his back wheels."