I've seen Avatar once (on TV) about a year ago. I can't even tell you the name of the main character without googling it. On the otherhand, I could probably rattle off the name of 40-50 individual Star Wars characters off the top of my head in less than 5 minutes. Even more interesting (to me), I have seen one Harry Potter film (once) and read none of the books, but I could name 5-10 characters from the series. Do you know why? Because the kids in my family wouldn't shut up about it for the past decade. That's an intellectual property with staying power.