I used to believe that the Diana Ross(?) song 'my simple heart' was bicycle hop. I thought it must be a sort of dance.
A childhood belief about misheard lyrics

others believed things like this
- The song called heart of glass mixed me up as a kid. I heard "Heart and ass". — oops
- I thought the song "Party Time" by Moby was actually saying "heart attack" (this was before I knew the title)— Elviessa
- I used to think my grandma was Princess DianaAnon
- I used to think that when people had heart attacks someone came and stabbed their heartAnon
- when i was 4 my mom told me we lived in Indiana and i would tell people we lived in DianaAnon
- I used to think that if you eat pig heart, you could grow another heart and be twice as healthier. Anon