In Russell Lee's True Singapore Ghost Stories (I forgot which volume was it though), he claimed that if you played Led Zeppelin's Stairway to Heaven song backwards that you could make out "satanic messages". Of course, I have my doubts just like anyone else out there. It's simply too much of a coincidence, but wait, seems like it might be true after all. Here are example of the various songs lyrics showed when the song's played normally, and the backmasking reverse lyrics version. Google for backmasking and you should find a couple of sites out there that does it:

Led Zeppelin - Stairway To Heaven's lyrics in actual order:

If there's a bustle in your hedgerow,
don't be alarmed now.
it's just the spring clean for the May queen.
Yes there are two paths you can go by,
but in the long run there's still time to change the road you're on.

Led Zeppelin - Stairway To Heaven's lyrics in backmasking reverse order:

Oh here's to my sweet Satan.
The one whose little path would make me sad,
whose power is Satan.
He'll give those with him 666,
there was a little toolshed where he made us suffer,
sad Satan.

Still don't believe me? Still doubting that I'm telling the truth? Well, go on over to jeffmilner.com/backmasking.htm and listen for yourselves. Just a note though, Britney Spear's Baby One More Time is included in the list too.