Woah. This is a dark dark book. It's the funniest I've read in a long time. I laughed constantly; I have a pretty messed up sense of humor and maybe you, dear reader, do not.
Reminded me of the 2nd half of Rick Moody's THE FOUR FINGERS OF DEATH.
Also, the cartoon ARCHER.
Give it a shot. Just don't expect a warm and fuzzy feeling at any point. Haha