John Dies at the End by David Wong

John Dies at the End is a comic horror novel written by Jason Pargin (published under the pseudonym David Wong) that was first published online as a webserial beginning in 2001, then as an edited manuscript in 2004 and printed paperback in 2007 via Permuted Press.

If you blended the works of Lovecraft and Kevin Smith, then mixed that with about three parts pure awesome and left it to grow behind your fridge, you might get a vague sense of the genre David Wong bullseyes with this book. It's funny enough to appeal even to non-fans of the horror genre, yet scary enough to stay with you for a long time. It's the sort of book that can raise specters so horrible you tell yourself you couldn't ever have imagined them, yet it keeps your faith in humanity alive with the way Dave and John (especially John) seem to casually flip off a barrage of unspeakable evil. In a book that opens fighting meat-ghosts with '80s glam rock, you know you're in for something special.

It's all about the soy sauce, a mysterious substance that "chooses" its takers and imbues them permanently with an ability to pick up on the doings of other dimensions. In the short term it can provide an insight into spacetime so profound as to tell them just where to go to get a large sum of cash, or how a chicken lived its life before becoming an entree. It's also the key to an invasion from the beyond, but it doesn't end there. The evil wants in, at any cost, and it's not above even cheap schoolyard-style bullying to get its way. Luckily, Dave and John know just how to handle that.