As a school kid growing up in the U.S. I was always quite disturbed when we sang "My country 'tis of thee". The line "Land where my fathers died" really perplexed me because I and my classmates mostly had fathers who were still alive.
A childhood belief about songs

others believed things like this
- I used to think that the song"Stayin Alive" said "Staying In Line" like at school when I was little. — MacKenzie
- I used to think that birds sang in different languages depending on the country they were in!— Sarah
- Until about age 9, I thought there was a country called "Operaland" where everyone sang instead of talking.Anon
- When my favorite Uncle died, I thought if I stared at him in his coffin he would open his eyes and be alive.— Cindy
- I used to think that
"The land of make believe"
was
"The land of baked beans."— Baked Bean! - Billy Squire sang about "My Kind of Lover". My wife sang about "My Candelabra"— Wailerman