Hmmmm,

I think Top 10 Opening Lines would be difficult because most of us don't memorize them, so it'd mean pulling books off the shelf, or spending time in the public library, to collect the list. A few would do that, but I doubt many people would.

Top 10 Fantasy Worlds sounds interesting, but I don't think I've read enough science fiction to come up with 10 good ones. Although, I'd probably change my mind once I saw everyone else's list and remember how much I have read/seen!

I think I'm gonna wo with Top 10 Science Fiction Films...