I'm surprised no-one here has noted that Freemasons, the llluminati, the guys from Bohemian Grove and the purple lizards were responsible for 9/11.
On the subject of conspiracy theories, mass marketing and the gullible, I thought the IP action between Dan Browne and the authors of The Holy Blood and the Holy Grail was a hoot - neither side not wanting to admit that it was actually responsible for a work of complete fiction, yet sparring with each other over rights to intellectual property. Much like two bald men fighting over a comb!