I remember listening to the radio in the car as a child when the hymn "How Great Thou Art" came on. Instead of "how great thou art", I thought it was "I'll break your heart."
A childhood belief about misheard lyrics

others believed things like this
- I used to believe God had a pet tortoise. There was a hymn we sang that went "Great things he hath taught us"— Lozza
- When I was in kindergarten, I thought the last line of "America" was "Great God our kid." — CC
- when the sign on the highway said do not pass and dad did i thought he would be in great dangerAnon
- I thought that FDR was an government organization during the Great Depression, not a president.Anon
- My great grandmother died when I was 9. I didn't go to the funeral because I thought she'd be a skeleton. — Angela
- When listening to the radio in the mornings I felt sorry for singers they had to come and sing that early. — Tereza