Warren Ellis and Phil Jiminez's censored Hellblazer story, "Shoot."
http://kabukivice.com/shoot/shoot.htm Read it before it's too late.
I was pretty bitter when they made such a shitty movie out of "Constantine." Everyone who's read comics with the character has a slightly different image of him. This is one of the two stories that I always, always think of when someone mentions John Constantine's name. Now, you tell ME that Keanu Reeves could deliver that.