I used to think that the 'vacancies' sign outside B&Bs / hotels meant that they had toilets (because of the vacant / engaged sign on public toilet doors!!) I never understood why anyone would go to a hotel with a 'no vacancies' sign.
A childhood belief about general

others believed things like this
- I thought for the longest time that a No Standing traffic sign meant no person should stand near that sign.— Shannon
- I thought that the sign "!" meant: "look at the wonderful landscape"— Giorgos
- my mom believed when she was little that a street sign that said don't walk meant you better run.— Sara Mclen
- I used to believe a dead end sign meant there was a graveyard at the end of the street or zombies — Still Out There
- I thought that the "don't walk" sign at crosswalks meant to run across the street as quickly as possible!— richard
- When I used to see a sign saying "Littering Fine" I thought they meant if you littered REAL GOOD!— Lou V.