When I was a kid, we visited Italy once. I noticed that in every city we visited, there were signs pointing to "Senso Unico", which I surmised must be some important building each city had, like a city hall. It never dawned on me to ask my parents what it was. So at one point we were in some small city in Tuscany, and my parents decided to hang around in a cafe, so my sister and I decided to go exploring the town. We took it upon ourselves to go and find the Senso Unico. The signs showing the way to the Senso Unico seemed to lead us all over the place, and eventually we ended up where we started. We gave up.
When we got back, we told our parents about the failed quest. It was then that we learned "Senso Unico" is Italian for "One Way"!
A childhood belief about road signs

others believed things like this
- I used to believe that electricity was manufactured in a factory in a place called 'Electriz City'.— Sally
- My parents told me that Jesus visited Santa Claus when he was dead for three days. — Rick Hamell
- That the city of Christchurch was a big church which everybody lived in.— Christine
- When, I was a kid, I used to believe that cane sugar came from the city Cannes Anon
- My friend was in Germany, and she thougth that "ausfart" was a city.— Tone
- I used to belive that all TV shows were taped in my home city, thats why they were shown here.Anon