In that Frankie Goes to Hollywood song, 'Relax', I used to think that he sang...
Relax
Don't do it,
When you want to suck a Chewit
I only realised it wasn't this when I looked on a lyrics website the other day.
A childhood belief about misheard lyrics

others believed things like this
- I used to think that Frankie Avalon sang, "Hey Penis, Oh, penis..." instead of "Hey Venus."Anon
- I thought that the Chewit wrappers were different flavours as they were different colours like the sweets— Helen
- i used to think in the song "hit me with your best shot" was really "hit me while i'm on pot" yea.... i suck!!— Donna
- for my little sis -
Paul McCarty song "Band on the Run" but when she sang it it was "Man has the Runs"Anon - I used to think that the actors on tv shows sang the show's theme song.Anon
- i thought I got one year older when my family sang the birthday song.— I am the ghost