The thread title of course refers to those spooky backwards messages that cause one to sign suicide pacts, steal from their mother's purse, etc...
Wikipedia has a great list, some have audio clips:
http://en.wikipedi...ackmasked_messages Personally I always thought the message on Stairway to Heaven was just gibberish and not intentional.
Here's a site where you can listen to a few of the more famous ones:
http://jeffmilner.com/backmasking.htm It's good creepy fun