A grad student I knew from England believed fireflies were imaginary, like fairies. Apparently they don't have them over there. When he came to the United States he was astonished to discover that there are bugs that give off light -- which is kind of amazing, if you think about it.
A childhood belief about creepy crawlies

others believed things like this
- I used to believe that America was one of the states of the United States.— Limor
- i used to think France was in the united states
— TY - I used to think that Los Angeles took up half the United StatesAnon
- I used to believe that the United States were a planet, since I'm from another country.Anon
- I used to believe that the maps for the United States and Texas were identical.— JTexas
- I used to believe that the United States covered almost the entire planet.— RAB