My Grampie used to tell us when we were very little that the sign on the road that says "Road Narrows" was a warning of little birds that peck your tires, so watch out. My cousin believed this until he was 15 and in driver's ED.
A childhood belief about road signs

others believed things like this
- I used to believe the "Yield" from the road sign was somebody's name.— julia
- i always thought that a DEAD END sign
as where they put all the road kill.
— pav - I used to think that we were breaking a law every time my mom passed a "Do Not Pass" sign on the road. — Kyra
- i used to think that the road sign "dangerous" was actually "dang-er-roos" a kind of bouncy marsupial— owen cash
- I used to believe that the "no outlet" sign on roads was a warning to people driving electric cars.— c
- I believed the mosque down the road was Aladdin's castle, and my mum went along with it to keep me happy.— Elena