I once heard some lyrics from The Human League's best known song "Don't You Want Me" as "Swish your legs to find" instead of "It's much too late to find". Listening to that song today I still have trouble hearing the proper lyrics at that spot.
I also heard the first line to their later song "Soundtrack to a Generation" as "First melody can only be be that way" when it's "The smell of trees".
A childhood belief about misheard lyrics

others believed things like this
- When I first heard Bruce Springsteen's song, "Born in the USA," I thought that the song was "Porn in the USA"Anon
- in the song with the lyrics "take your passion" my sister used to always think it was "take your pants off"— Steped
- My mum always thought the lyrics to macy grays song was i try to say goodbye to my chook.— alana
- i believed that michelle gayle's sweetness song contained the lyrics shade in sheep shit!— andrew
- whenever i heard a melody, i thought it stuck in my stomach when i heard it in my mindAnon
- In a religious song, instead of “Jesus Christ” I heard “Cheese is Prize”— EJ