Piece of Mind (Iron Maiden) Easter Egg - Meddle

Put on the album Piece of Mind and cue up the song "Still Life.
You will hear some back masking at the beggining.
This was at the time when back masking was very prevelent amongst some radical religious groups. Play this part of the album backwards. You should hear Maiden saying the line, "Do not meddle with things that you don't understand", backwards on your record player.