What are kids thinking?

So I was reading Laurens blog about the funny things that kids say. I was sitting in my living room and I was laughing and my son asked me what I was laughing about. I will get right to the point, I started asking Ayden some of the questions, I got to the question "how are we the same" and he answered that we have the same eyes, which we do. Then just as I am about to move on to the next question he throws in "and the same penises" I ask what do you mean. And he reply's "when you were a baby you had a penis like me" I told him that we(girls) do not have penises...we have vagina's. He gives me his cute smile, that smile that means he knows more than me and says..".well, before yours fell off!" Can you imagine? I was laughing so freaking hard. Honestly, I am a little nervous about him going off to school. Do you even remember not knowing how things work? I used the word "actually" and he said mom, you need to stop using words I don't know, or how do you want me to listen. I not sure that I can raise boys...I am already at a loss for words. What happens when they are men?