i used to think the hyena's line in the lion king song "Be Prepared" was 'make love to the king' (as oppose to long live to king) My mum tried to subtly suggest that this wasn't entirely correct, but i was utterly convinced and went on singing it at the top of my voice regardless - completely unaware of the implications!!
A childhood belief about misheard lyrics

others believed things like this
- when ever i ate broccoli i thaught the monkey from Lion King was in there— Simon
- I grew up believing meerkats have human hands because I learned about meerkats from The Lion King.Anon
- when i was a kid, i used to believe i was actually a king who was in a coma dreaming about being a kid.— r
- i used to believe that god was the king in sleping beuty — stupid:D
- I used to believe that if you kiss a frog then the would would really turn into a king.— jing
- I used to believe Martin Luther King chose your birthday.Anon