My parents aren't all that into science fiction, but when the Star Wars Special Editions rolled into theaters, my parents discussed taking me to see the first one. I was 12 at the time.
"Do you think it'll be too scary for him?"
"Well, if it is, we can leave early."
So, we went to Montpelier's Capitol Theater, where I spent the entire film with my eyes glued to the screen, and babbled the entire way back about how cool it was. A week or so later, we went to The Empire Strikes Back, and shortly after that, to Return of the Jedi.
Since then, science fiction has been a major part of my identity, and I can't be happier. Thanks, Dad!