I used to think the John Lennon - Merry Christmas (War Is Over) song said 'Let's hope its a good one, with plenty of beer' instead of 'without any fear' as my dad always sang it like that...
A childhood belief about misheard lyrics

others believed things like this
- I used to think that Lenin and John Lennon were the same person.— Melanjolly
- I used to think that the Beatles broke up when John Lennon died.— Shirley B.
- I was told that for every christmas carol i sang before christmas time santa would give me one less present!— K
- I used to think that Root Beer was beer with less caloriesAnon
- As a child I used to think that Olivia Newton-John and Elton John were married.
Boy, I was way off.— Lisa - i used to believe that root beer was made with root juice and beer— tm