I used to dislike the old Sunday School Song, "I have the joy, joy, joy joy down in my heart," because I thought the lyrics were "down in my heart Tuesday." (Real lyrics: "Down in my heart to stay.") I sang it submissively for awhile, but got so bothered by the fact that, although today wasn't Tuesday, I still had the joy in my heart. So I would always sing the current day under my breath just to prove I was joyful today. (i.e. "Down in my heart Friday...")
A childhood belief about hymns

others believed things like this
- The song called heart of glass mixed me up as a kid. I heard "Heart and ass". — oops
- I used to think that when people had heart attacks someone came and stabbed their heartAnon
- I used to think that if you eat pig heart, you could grow another heart and be twice as healthier. Anon
- when i was a little kid. i used to think that when u hold ur breath ur heart stops.. LOL :P — Annonymus
- I thought the song "Party Time" by Moby was actually saying "heart attack" (this was before I knew the title)— Elviessa
- When I was in elementary school, I believed my heart moved across my chest throughout the day.— Allison