House of Leaves - just an interesting, compelling book. It's "odd" in a way that might leave you imagining it's just a gimmick but it really isn't - the structure of the pages and the odd story, footnotes, appendixes... they really create a surreal, amazing experience.
It's something like Stephen King, Jorges Luis Borges, Nabokov's
Pale Fire and the Talmud!
It actually has a rather impressive
wikipedia page as well.