Harry Potter. Though it's been awhile since I read the books (I admit), I've read each one at least three times along with reading [i]The Tales of Beetle the Bard, Fantastic Beasts and Where to Find Them[/i] and [i]Quidditch Through the Ages[/i].

Adventure Time. I can't claim to know too much about it at this point since I think I haven't seen but a couple episodes after the first couple seasons so I probably won't be all that knowledgeable... 

Left 4 Dead. I've played both games on expert (at one point) buuut it's been awhile.

A:tla I know a bit about the fandom having seen all the episodes but it's been a bit since I last visited it.