The song sk8er boi by Avril Lavigne used to be one of my favorites. Except there was this one line where I heard:
"Sorry girl but you missed out
What the f*** that boy's mine now"
And actually, it goes:
"Sorry girl but you missed out
Well, tough luck that boy's mine now"
oops.
A childhood belief about misheard lyrics

others believed things like this
- Phil Collins song "I missed again" - I thought it was "I pis*ed again" - didn't realise he was an alcoholic?!Anon
- My friend's sister believed the lyrics to Gazza's "Fog on the Tyne" were "Fog on the dinasaurs mine all mine"— Suzanne
- When I was little, I use to think if you missed a day of school, you would be arrested.— Kaity
- I thought that the song "Hands off she's mine" by The English Beat was actually saying "Anton, she's my aunt"— Nate
- When I was younger, I saw Madonna's video for "Material Girl". I thought she was singing "I'm a Cheerio Girl"!— Greg
- I used to believe that the words to Michael Jacksons "Liberian Girl" were "librarian girl".— Paul