I used to think that in the National Anthem the part where they say "dawns early light" was "donzerly light" and that donzer was just a word I didn't know.
A childhood belief about misheard lyrics

others believed things like this
- I used to believe there was a newsreader inside the radio where the light was!!— Christine
- Whenever I went to bed, I use to believe that when i flicked my light on and off I would signal aliens. — Laura.
- I used to believe that God was the light rays shining through the clouds.— Lynn
- I used to think light sabers were called life savers.— alison
- In "God Bless America" I thought it was "With the light from a bulb" instead of "from above."— Carol
- I used to believe that switching the light on and off was morse code to burglarsAnon