The Jihad to Destroy Barney RPG And Writer's Guide is a fan-made supplement for GURPS 4th Edition describing a world in which a high demon is able to operate nearly openly in his quest to take over the world. Players play Jihaddi, those who have been made aware of the threat. The intended playstyle is a black comedy conspiracy, and the gamebook continually crosses the line between being serious roleplaying setting and parody of other dark conspiracy roleplaying settings.