When I first saw "The Sound of Music," I was baffled as to why they would be sending Maria away when they'd just sung about how good she was at solving all sorts of difficult problems. "How do you solve a problem like Maria...?"
It wasn't until much later that I realized Maria WAS the problem.
A childhood belief about misheard lyrics

others believed things like this
- I used to think MARIA is the WIFE of JESUS!— Chrono
- I thought Maria Carey's 1998 ballad was 'I'd give my arms' instead of 'I'd give my all'.— Briony Maggs
- I used to believe that 7 times 12 was equal to 83 or 84, depending on the math problem.— Eric Swensen
- i used to believe Houston was a person, not a place (as in, "Houston, we have a problem") — Kirsty
- I used to believe that the video clip are realized in one time and the singers are singing with to the music Anon
- For the longest time I didn't know that Spinal Tap wasn't a real group. No wonder I couldn't find their music.— Louis