I used to believe that "ambulatory" meant "sick". After all, ambulances are for sick people, right? I was confused when there was a Disney ride that said "must be ambulatory" because why would you need to be sick to go on a ride?
A childhood belief about being ill

others believed things like this
- 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 think that the word blurb was a noise that people made when being sick. Bluuuggghhh.— Natasha
- I used to believe that doctors could not get sick.Anon
- When I was little I thought if you were sick the only way to get better was to give it to someone else.— Jen
- If you cut or pluck a cats whiskers they could get sick or die.— Paul Adam Trepanier
- My mom used to tell me that animals with red eyes were sick....rabbits, hamsters, ect....— Umm...