As a child i always thought the song Son of Hickory Hollers Tramp was about a boy who's Dad was a tramp!
Wasn't till my 20's when listening to the line "Outside the door there burned a scarlet lamp" i realised he was singing about his Mum!!
A childhood belief about misheard lyrics

others believed things like this
- That song that goes:
I'll never let you go...
I thought he was singing:
Another machine gun...
Haha.— Kelle - The buckinghams song "kind of a drag", i always thought they were singing, "Canada Dry"— bobbybobby
- When I first heard the song "Constant Craving" by KD Lang, I thought she was singing "God save gravy."Anon
- We had an antique lamp that I thought was hideous and for years I thought "Art Deco" was a synonym for ugly.Anon
- I used to think that mere marrying will lead to child birth,till i was 10.— dan
- When I first heard Matt Monro's song "Born Free," I thought he was singing "Porn Free."Anon