In A Witch's Wardrobe by Juliet Blackwell
Don't you remember the old controversy over the backward lyrics in rock songs?
My brother and I tried to play Queen's "Another One Bites The Dust" backward, but we didn't hear anything (nor did I know what it was supposed to say).
This article talks about backmasking and provides examples, including this song. IMO, you have too much time on your hands if you think Led Zeppelin is talking about Satan.
...it looked like I was going to have to get happy in the same pants I got mad in.
This just seemed like a funny quote.