Nick and Norah's Infinite Playlist was originally the novel written by Rachel Cohn and David Levithan.  

This got my notice after Scott Pilgrim vs the world movie, which is a lot of fun.

OK.  This is about young people, getting lost and drunk and somewhere in between boredom and excitement found love.

Sure. Why not. The brain is not functioning all that well, when persons that they loved dumped them like yesterday fashion. Why do some young persons (and some older one) think it is find to break another person's heart.

OK. Too much? That's about right in the mood for watching this movie or reading this book. Or you wouldn't "get it".

Go read.