Quote Originally Posted by Ulysses S. Grant View Post
Once again the Deciever trumps all. He tricked the Nightbringer into eating its fellows and the rest followed suit. There is also a piece of fluff which even hints that the laughing god is in fact the Deciever in another form (The exact source for this no longer exists on the GW website but Lexicanum source it here: http://wh40k.lexicanum.com/wiki/Deceiver)

If the Deciever can successfully impersonate a warp entity, then I think he has definatly earned this title (Warning: Tv Tropes link and mild language)