I used to believe that in The Killers "Mr. Brightside" that instead of "Open up my eager eyes" he said "Open up my ears and eyes", until one day my sister started cracking up lauging at me and told me what it really was.
A childhood belief about misheard lyrics

others believed things like this
- When I was little my friend told me that if you snease with your eyes open you eyes will fall out!Anon
- I used to believe that if you sneezed with your eyes open you would die!— Becky
- I used to believe that newborn babies didnt open their eyes for a few weeks like kittens :) — Cash
- When my favorite Uncle died, I thought if I stared at him in his coffin he would open his eyes and be alive.— Cindy
- I used to believe the ^^ emoticon referred to 2 pointy ears like a cat, instead of closed eyes.Anon
- I was born brunette with brown eyes and dark hair, i thought people with blue eyes, had water in them.Anon