I once saw a sign that used to the word 'Prohibited" and I asked my dad what he meant. He said it meant it was forbidden.
So for the next few years I believed the word "prohibited" was pronounced "forbidden". It wasn't until I was reading a sign aloud that a friend of mine asked why I said "forbidden" instead of "prohibited" and I realised that they were actually separate words.
A childhood belief about speaking

others believed things like this
- I used to believe the Do Not Pass signs on the roads meant you were'nt aloud to pass the sign. I was 14.Anon
- I thought for the longest time that a No Standing traffic sign meant no person should stand near that sign.— Shannon
- my mom believed when she was little that a street sign that said don't walk meant you better run.— Sara Mclen
- I fully believed, up until about 6 years old, that the word 'accident' was a noun that meant 'burnt toast'.— Karl Goetz
- my husband believed, until recently, that the word "several" meant seven of something. — sheryl
- I thought that the sign "!" meant: "look at the wonderful landscape"— Giorgos