The Lord of The Rings, translated into l33t5p34k: F3ll0wsh1p of teh R1ng (scroll down a bit) and Teh Tw0 T0werz. Not mentioned by most other linkers: The first link starts with a hilarious list of “survival tips” for watching the movies in theaters:
7. Finish off every one of Elrond’s lines with “Mr. Anderson.”
16. Every time someone kills an Orc, yell: “That’s what I’m Tolkien about!” See how long it takes before you get kicked out of the theatre.