A question for you

What is your favourite YA book of all time? I just want to check I'm not missing out on any gems. Even though my to-read pile is almost as tall as I am, I think it can still get taller before it topples over and squishes my two cats in one of those all too frequent 'YA books killing cats' tragedies.

Is there ONE YA book that you recommend to everyone you meet, even the people who sneer at the idea of reading 'children's' books?

I rave to anyone who'll listen about Elsewhere, by Gabrielle Zevin, and The Hunger Games, by Suzanne Collins... So which book turns you into a crazy-eyed YA evangelist?