My parents were big fans of the show "Cheers." Whenever I heard the theme song, I thought that "You want go where everyone knows your name" was actually "You want to go where everyone knows Yulnay" and that Yulnay was some really cool person.
A childhood belief about misheard lyrics

others believed things like this
- Until I was about 15, I beleived my Father was the person who sang the "Cheers" TV Show Theme Song.— Dustin
- I used to think that the actors on tv shows sang the show's theme song.Anon
- When I first heard Bruce Springsteen's song, "Born in the USA," I thought that the song was "Porn in the USA"Anon
- I used to believe that Elvis died when he was trampled by fans.— Aretia
- When I first heard the song "Constant Craving" by KD Lang, I thought she was singing "God save gravy."Anon
- in the song "show me heaven" i used to sing "make me breakfast" instead of "leave me breathless"Anon