I'm not sure I want to know how many times I've watched these.

Tear You Apart by bradcpu
Firefly
The happiest ship in the world made bloody disturbing. It explores a very interesting idea. I love the use of secondary footage in this vid.
(Song: Tear You Apart by She Wants Revenge)

Handlebars by flummery
Doctor Who
The video synchs with the lyrics of the audio in all sorts of wonderful ways. It is, by turns, wonderfully amusing and frigheningly true in the story it tells. It reminds me of a number of the doctor's more scary aspects and the ending is perfect.
(Song: Handlebars by Flobots)

The Bitch Prince by wistful_fever
Merlin
Arthur is such a bitch. The vid's incredibly pretty and rather well structured. Much of what I like about the show is here.
(Song: Bitch by Meredith Brooks)