In Fleetwood Mac's song "On the Edge of Seventeen" I thought the lyrics were:
Just like a wild wingdah
Sings a song sounds like she's singing
Ooh, baby, ooh, say ooh.
I always wondered what a "wild wingdah" looked like - I imagined it was a large bird with enormous brightly colored wings. Guess I had a good imagination :)
A childhood belief about misheard lyrics

others believed things like this
- I thought buffalo wings were wings from a buffalo, for years I looked for their wingsAnon
- i thought that new disney peter pan song said "spread your legs" but its really "spread your wings"— shasta
- That song that goes:
I'll never let you go...
I thought he was singing:
Another machine gun...
Haha.— Kelle - i used to believe if a cat ate a bird the cat would eventually GROW WINGS!— nightmare
- My mum always thought the lyrics to macy grays song was i try to say goodbye to my chook.— alana
- When I was a child I used to belive that if I put on cardboard wings I could fly like a bird.Anon