When I was little, I heard of someone having a "short fuse" and thought it meant a short memory and that the person was very forgetful.
A childhood belief about speaking

others believed things like this
- Since the girls name Jackie is short for Jacqueline, I thought the boys name Jack was short for JackalAnon
- I used to believe that showing my bare arms meant that I was naked, so I never wore short sleeves as a kid. Anon
- I used to think that the UK was short for Ukraine.— Mia
- I used to think Obama's name was short for Baraccobama.— Trisha Gaurav
- I used to think monk was short for monkey.Anon
- I used to believe that accord was short for accordionAnon