How Do We Know?

I can't believe I almost forgot this.  I was so disappointed I didn't have the video camera rolling.  The day we found out and told the kids we're expecting a boy, John stewed on it a while.  As we finished dinner he asked, "But, how does Mom KNOW it's a boy?"  We had forgotten to show them the ultrasound pictures, so Buck began to show them.  He got to the "It's A Boy" shot and started describing it.  "Here's one leg, here's the other leg, and what do you think this is between the legs?"  Answers..."His head!"  "His arm!"  "Nope."  As they guessed and we said no, John started to get that immature, slightly embarrased look on his face.  He knew what it was, but was afraid to say.  Finally Buck asked, "John, what do you have between your legs?"  John giggled, red in the face, and blurted out, "A peepee!" after which everyone giggled.  It was so cute and funny.  Now he's telling everyone that's how we know.