A little boy brags to a little girl, "I have a big fire engine."
The girl responds, "So what? I have a fire engine, too."
He says, "I have a toy tank."
She replies, "So what? I have a tank, too."
The young boy drops his pants and says, "I have a penis!"
The little girl looks down her pants and runs home crying.
The next day, the little girl sees the little boy, and he tells her, "You still don't have a penis, and I do!"
She replies, "My mom told me not to worry about it. She said that as long as I have what I have, I can get as many of those as I want."