There is this old Alan Jackson song called "Chasin' that Neon Rainbow". When I was little, I pictured someone chasing a knee into a rainbow.
A childhood belief about misheard lyrics

others believed things like this
- "Somewhere over the rainbow
Weigh a pie."
Why did Dorothy weigh a pie somewhere over the rainbow?— John - I used to believe that was a treasure in the end of the rainbow— Marcos Vinícius da Rocha Ava Nimbuvui
- when I was a kid I used to believe that the end of the rainbow would be a pot of gold— jonas bryan proença de souza
- i used to believe that butterflies are fairies that crossed the rainbow— sillyme
- I used to believe that the rainbow is produced by the elves' pot of gold— Santiago Gordillo
- I used to think that unicorn existed and that they do rainbow poop. — Janira duran