Years ago, Penn & Teller, the magicians, did a hone video about how to run scams on people(none of which were actually quite illegal, more or less) which included a "backward-masking" which involved an evangelical preacher which supposedly involved the preacher's sermon including Satanic messaging. Penn Gillette, the talking member of the act, prefaced this section of the clip by noting that, if "backward-masking" actually worked, Ozzy Osbourne would be the prime minister of the UK.