I used to believe that the song 'right here waiting for you' was 'a building right here waiting for you'..
I also thought that the song by Mercy Playground said 'like a double sheppards pie', when it really says 'like a double cherry pie'.
But the funniest would have to be my bro singing 'do you believe in love like a dove'.. instead of 'do you believe in love after love'.
A childhood belief about misheard lyrics

others believed things like this
- I used to believe that the B-52's song "Love Shack" was actually "Love Shark!"— Natalie
- I used to think the song "love the one you're with" was called "love the one, your win. — Glowworm
- In Beyonce's song 'Crazy in Love', I always thought she said 'Daisy right now'.Anon
- I always hear Manic Street Preachers 'You Love Us' as 'You Love Arse'.— Lou
- that song that goes *bring me a higher love*
i thought it said *breathing in iron lung*— oi - I am Canadian and when I was little I would sing "True Pastry Love" instead of 'True Patriot Love"— Jess