Oh used to think that song that went 'paved paradise, put up a parking lot', went 'crave paradise, to put up with f*ck in life'. I was apalled when I heard my mom singing it in the car.
Also, that Justin Timberlake songs (cry me a river) that goes 'The damage is done so I guess I'll be leaving', I thought it was, 'The jammy jee jones so I guess I'll be leaving'. Dunno where I got that from.
A childhood belief about misheard lyrics

others believed things like this
- When I first heard the song "Constant Craving" by KD Lang, I thought she was singing "God save gravy."Anon
- When I first heard Matt Monro's song "Born Free," I thought he was singing "Porn Free."Anon
- I used to think if you got a parking ticket, you spent the rest of your life in jail!— Dixie Chicks Fan
- I used to believe that on your birthday everybody would worship you! (I guess I was wrong).— supergirl
- so guess what i learned the other day: pickles came from cucumbers. yes indeed.— jenna
- i used to think that being a prostitute was a religion. (sort of like protestant i guess?)Anon