When I was about 7 and my sister was 4, she used to drive me up the wall by singing: "when you're in love with a beautiful womble" instead of "... ... beautiful woman". I can see how she made the error. Whenever I hear the song now, I always insert "womble" - it makes me chuckle...
A childhood belief about misheard lyrics

others believed things like this
- I always hear Manic Street Preachers 'You Love Us' as 'You Love Arse'.— Lou
- 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
- I used to hear "Everytime you go away, you take a piece of Meat with you"
Makes a nice light snack I spose.— Linda - I thought the line in the song "more than a woman" was "four-legged woman".— boo
- When Madonna sang "let the choir sing" in "Like a Prayer", I thought she was singing "love by proxy"— Kristen