The one thing that all boys from my generation have in common is that we all loved Star Wars growing up. I don't know if that still applies to all boys, but I do know that a shared fanhood of the original trilogy was pretty much the only thing we all had in common.
(This isn't to say that Star Wars can only appeal to boys; obviously Leia is one kick-ass chick and Han Solo is God's gift to the female gender. But Star Wars love was universal in my pre-prequels age group, and almost nothing else was.)
What I've always wanted to know is, what is the female equivalent of Star Wars? What is the one pop culture thing that all the girls my age grew up loving? I've raised this question with different women before, and I've heard suggestions ranging from Little Mermaid to The Last Unicorn. But I have my own guess: I think it's Grease.
Face it: If you were a girl growing up in the early-to-mid-80s, you loved this. It pushed all of your female buttons and taught you what you were supposed to be like. I have not encountered a single women in this category who has disagreed (except for my wife, but I'm going to consider her a sole exception for now).
Of course, I'm probably totally off base. But if I am, what would be a better choice? It pains me to think that all the little girls growing up today are going to share an undying love for Twilight in common. So there had better be something good that women from my generation all loved.