I used to believe that the Muse song Time Is Running Out said,
You'll buy me on the tenth of May.
The actual lyrics are
You will be the death of me.
Sang it to Matt Bellamy once.
He didn't hear me. :(
A childhood belief about misheard lyrics

others believed things like this
- Actual lyrics: "I've never been your beast of burden"
My lyrics: "I've never been your big suburban"
— Big Suburban - When I first heard Matt Monro's song "Born Free," I thought he was singing "Porn Free."Anon
- I used to belive that if I put my finges in my ears when i sang noone could hear me— Helen
- for my little sis -
Paul McCarty song "Band on the Run" but when she sang it it was "Man has the Runs"Anon - I used to think that the actors on tv shows sang the show's theme song.Anon
- i thought I got one year older when my family sang the birthday song.— I am the ghost