When I started thinking way too much about zombies: When I first saw Night of the Living dead at about the age of 13.
What started my zombie fixation: It was about after the time I watched Night of the Living Dead and before and during the time I read the Zombie Survival Guide
Favorite zombie movie: I'm going to say either 28 Days Later or Night of the Living Dead ^^; Although I enjoy almost any Zombie movie (although I do enjoy I Am Legend, contrary to popular belief, they are not zombies).
Favorite quote in any zombie movie: "Every dead body that is not exterminated becomes one of them. It gets up and kills. The people it kills get up and kill." - Dawn of the Dead