I was a fully functioning adult when I heard this one.. there's a nifty Van Morrison song which says: "And we walked the pagan streams". But I was hearing "And we walked the pig in strings", which puts a whole other slant on Celtic mysticism.
A childhood belief about misheard lyrics

others believed things like this
- I used to think that if you walked down a dead end street you would die.— holly
- i used to believe that if i walked in the rain i would grow taller.Anon
- I used to think the moon followed me when I walked home in 2014.— Cookies
- I used to believe that if you walked directly over someone's grave, they would haunt you forever.— jonee
- i used to believe that dogs were furry midget who walked on for legs— doggy
- When I was younger, I used to think people in China walked upside down.— Max