Look up David John Oates, of ReverseSpeech.
http://reversespeech.com/
People have spun records backwards and claimed to uncover subliminal messages - usually deliberately embedded - for ages. This guy, though, takes it to another level. He believes (and has written books on it, done tours etc ) that the human mind has an innate ability to communicate the speaker's true intentions via embedding messages in forwards speech on a subconscious level, that are only found when listened to in reverse.
This apparently is something that develops before we are able to speak correctly forwards, as he has demonstrated with recordings of babies gurgling that supposedly say something coherent when played backwards. I've been interested in this guy for many years, for a couple of reasons; firstly I believe he truly believes this stuff, and if you listen it's incredibly tenuous, yet he's managed to make money off it. Secondly, the idea that the brain is somehow capable of performing this feat has a wonderful air of "truthiness" to it - it's kind of a science fiction type idea really, reality stretched just a little too far to be really plausible.
