Yeah, you in the back row, crying your eyes out like it's a rescreening of Titanic. This is celebration day! Last day of school! Pull it together!
Sure, there will be tears eventually (or in an hour), when he realizes not all teachers are adorable 20-or-30-somethings. He will sigh at the exasperation enrollment and doctor's forms and learning names will cause. There will be gritting of teeth and forgotten homework, and eventually, yes, puberty. You can cry then.
But today? Smile for your boy... because he is on a fantastic adventure and he knows it. And so are you... because you gave birth to him and God said, "Show him the world."
So what are you waiting for? Dry your eyes. Let's do this thing.