This one comes via @SamelaAnderson. Unlike a lot of spam I've been getting lately, is pretty easy to figure out: KILLER DEMON wants money in exchange for betraying his client (I'm guessing the Assassin's Guild frowns on this kind of behavior).
Hoax Slayer says this scam has been around since at least 2007. Here are a few more examples:
Any of you guys fallen for this one?
Tell us your story in the comments Never tell anyone and turn off your computer forever.