My youngest brother was known for being musical as a kid and we'd always catch him singing and dancing. The best part of his little act though were his miscontrued lyrics. The one we will never let him live down is O-Town's liquid dreams, where instead of " She's a dominatrix, supermodel, beauty queen," he'd sing "She's a dumb and naked supermodel beauty queen" (though I'm pretty sure the image of that is enough to give most guys liquid dreams...)
A childhood belief about misheard lyrics

others believed things like this
- When I was about 5 or 6, I used to think the song 'Beauty and the Beast' was really 'Beauty and the Beef'.— Natski
- At the age of about 4-6, I thought a supermodel was someone who made clothes.— Walker
- I thought the song Shattered Dreams was acutaly "Shadow Dreams" and wondered what shadow dreams were— Golgademon
- I used to believe that my mum was the queen. She does look a bit like the queen... minus the orb and sceptre.— Vix
- In Queen's Bohemian Rhapsody, I used to think they were singing "Beelzebub has a devil for a sideboard!"Anon
- I used to believe that beauty marks (freckels) were Butterfly bites!— Jolene