TV Tropes

The TV Tropes wiki is a huge compendium of well-worn narrative tropes from television, film, books, comics, and video games; for starters, consider the important effects of genre blindness and the idiot ball. Eventually you'll find your way to the SF tropes subpage, which endlessly catalogs, among other things, stock superpowers, just what can be done with time travel, and, of course, the inevitable apocalpyse...