Up until a couple of weeks ago (and I'm nearly 40 !), I was convinced that in the song "How Deep is Your Love", the Bee Gees sang that "You came to me on a submarine". I've always thought it was a bizarre lyric. (It's actually "on a Summer breeze")
A childhood belief about misheard lyrics

others believed things like this
- Even though the title is 'How Bizarre', I always thought he sang "help is on"...Anon
- When Madonna sang "let the choir sing" in "Like a Prayer", I thought she was singing "love by proxy"— Kristen
- I used to believe that the B-52's song "Love Shack" was actually "Love Shark!"— Natalie
- My buddy used to think that when Steve Millers sang "Jungle Love" he was actually saying "Chug-a-lug" — Harold
- I used to think the song "love the one you're with" was called "love the one, your win. — Glowworm
- I always thought that "Staying Alive" by the Bee Gees was sung by Aretha Franklin.Anon