What song's lyrics did you get wrong?
One that comes to my mind--since I just heard it on a commercial-- is from a song (that I absolutely can't stand) by Hot Chocolate's "You Sexy Thing". When I first heard this as a child, I though it was, "I believe in milk holes, praise the lord, you sexy thing."
It made no sense to me. "What the fuck are milk holes? Oh, Miracles..."
I can't think of anymore atm, but I know there are a lot of songs where I got the lyrics wrong.
So, what song's lyrics did you get wrong? The funnier the better!