When I was young I believed that in Queens Bohemian Rhapsody they sang..."Hes just a poor boy from a poor family. Spare him his life from these pork sausages!" when it was actually..."Hes just a poor boy from a poor family. Spare him his life from this monstrosity"
Also when I heard ABBA singing Super Trouper I thought the lyrics were..."I was sick and tired of everything, when I called you last night from Tesocs" when it's actually "I was sick and tired of everything, when I called you last night from Glasgow"...oops!
A childhood belief about misheard lyrics

others believed things like this
- I used to believe it was illegal to shop at Goodwill unless you were poor.— Aretia
- I used to believe that a brothel was where poor people used to go to get free broth.— Rob. UK
- In Queen's Bohemian Rhapsody, I used to think they were singing "Beelzebub has a devil for a sideboard!"Anon
- i thought that "aromatic" duck was actually "asthmatic" duck.
poor thing...— rachael - I used to believe that only 'poor' people had to go to the bathroom, that 'rich' people didn't.Anon
- When you are very poor you "can't make end's meat." End's meat is some sort of cheap very low quality meat.— Betty