When I was eight years old I thought the Billy Joel song "scenes From An Italian Restaurant" said "well they got an apartment with deep pile carpets and a couple of painted brazzieres. The real lyrics are "a couple of paintings from Sears"
My sister heard me (unfortunately) singing it wrong and I still hear about it to this day! :-(
A childhood belief about misheard lyrics

others believed things like this
- I used to think that Sylvester Stallone and Billy Joel were the same person.Anon
- that the word "couple" as in "a couple of items" was synonymous with "several", rather than "just two".— Blair A. Petterson
- I used to think the olden days came once every couple of yearsAnon
- When I first heard the song "Constant Craving" by KD Lang, I thought she was singing "God save gravy."Anon
- i thaught the michael jackson song billy jean song said Janet's not my son Anon
- in the song with the lyrics "take your passion" my sister used to always think it was "take your pants off"— Steped