In the Christmas song "Oh Holy Night", I misunderstood the line "Fall on your knees, oh hear the angels voices".
I thought it was "Fall, Anyanees", and Anyanees was the name of one of the shepards.
A childhood belief about hymns

others believed things like this
- I thought if you trip and fall down you fall at the speed of light!— Dietrich Corby
- I used to think the song"jesus, oh what a wonderful child so holy, meek and mild" was "so holy, Mickey Mouse"— Stephani
- I thought the Til Tuesday song said "Books are scary!", rather than "Voices Carry"Anon
- i always thought that when someone broke their arm or leg, it would fall off.Anon
- i thought if you went to the bottom of the earth you would fall off.— Tiffany Amber Stefanko
- I thought I would fall through the cracks in my grandmother's deck.— Hannah