This, my friends, is a loaded question! I'll do my best to keep this orderly.

I am a huge TV buff. My current list of shows that I fan-girl over are as follows:
Doctor Who, Sherlock, and Supernatural; aka Superwholock - I'm still on the second season of Supernatural, but moving quickly through.
Firefly - "Take my love, take my land." I'll be a browncoat till the day I die.
Other shows: Once Upon a Time, Lost, How I Met Your Mother, American Horror Story, Walking Dead, Castle, Game of Thrones, Warehouse 13, Defiance, and Eureka.

Other notable fandoms:
Neil Gaiman
Various Models (Ophelia Overdose, Mosh, Miss LouLou)
Labyrinth
Mirrormask
RUSH (my all time favorite band, love me some concept albums/songs)

There are so many others, books, movies, shows, music, couples... I could go on and on. xD