I thought "Mares eat oats and does eat oats, and little lambs eat ivy" was Maresie doats and dozie doats and little lambsie divey. I just figured it out about 5 years ago and I'm 54. Little slow on the uptake!
A childhood belief about misheard lyrics

others believed things like this
- I used to believe that the duo Hall & Oats were farmers. Why else would they name themselves "Haulin' Oats"?— Pat
- I thought Hall and Oates was Holland Oats.Anon
- I used to believe that the man on the moon was the Quaker Oats man!— Kristen
- I didn't mind eating lambs brains when I was a kid because I thought it would make me smart.Anon
- i used to think mashed potatos were made from apples becouse they were the same color(i was a very slow child)— apples and ornges
- i thought the name Anon, was really a name...pronounced A-Non...haha i figured it out— Norman einstien