I used to believe GPS stood for Ginormous Processing System.
A childhood belief about speaking

others believed things like this
- i used to believe (because my dad told me so) that AM stood for "awful music" and FM stood for "fine music"— skydvgrl
- I used to believe that I invented the X Y coordinate system.Anon
- when I was small I always thought that the solar system ended, and then it was just white paper after that— sparrow
- When I was younger, my brother told me the police had an infra-red system and could see into everyones house.— Clare, Ireland
- i used to believe A.D. stood for "after dinosaurs".— Jennifer
- i used to think that shtml stood for
"sh*tmail".— anonymous