This time, a conspiracy theory from a completely different realm: the music industry. A long standing contemporary legend claims that Paul McCartney died in a car crash in 1966 and that an impersonator took his place right after the tragic event. As far as I am aware of, no professional documentary is available on this subject. The best ones available are included underneath. Black Bag has an excellent article on the subject, as does wikipedia. Snagfilms has a spoof mocumentary on the subject.
Paul Is Dead? Media Myths and Legends