When I was a kid I used to believe the "Help Wanted" signs up in store fronts were really a political statement in direct opposition to "Wanted: Dead or Alive" type posters.
A childhood belief about going shopping

others believed things like this
- I used to think the old BBC logo that was on one of my videos as a child was evil and wanted me to be dead.— tanukibear
- I used to believe that "DEAD END: signs meaned it was the end of the world and you would fall off completely— Kristin
- I used to believe that I really COULD be anything I wanted to be when I grew up. I wanted to be a unicorn. Anon
- I used to believe "Pedestrians" was a political party like Democrats or Republicans.— August
- Having seen enough red octagonal STOP signs in my time, I used to look out for green circular GO signs.— Gary
- my sister used to tell me that manhole covers were direct portals to hell.— autumn