The first time as a child that I became acquainted with the "outbreaks" of 13- or 17- year cicadas, and saw their dead skeletons lying around in considerable numbers, I thought I was hearing these insects called "adas" and I thought that what was happening was that they got sick every 13 to 17 years. That's because I thought I was hearing of the "sick adas" that were dying in big numbers when the 13 to 17 year illness hit.
A childhood belief about creepy crawlies

others believed things like this
- I used to believe that numbers had gender, that the odd numbers were boys and even numbers were girls. — Evelyn
- This may sound absurd but I thought the numbers next to the Bible versus said what time the person said it at!— Biomeka
- I used to believe there were numbers called "onety" and 'twoty." I thought "twoty-nine" came before twenty.— CC
- I thought pretending I was sick to stay home from school was called cookie not hookie.— Jen
- I thought Pink's "You make me sick" was "you make me sick, you make me look like a candlestick" LOL— Rice
- I used to be terrified of the numbers 18 and 19. I think I thought that when you turned 18 or 19, you die.— Emmy