I used to believe that the Speed Limit signs were pronounced "Speed Lime". Apparently I had seen something in French with a silent T at the end, and thought all T's on the end of words were silent. To this day I read it that way in my head while I'm driving. "Speed Lime 45."
A childhood belief about road signs

others believed things like this
- I thought that if you were speeding and hit a speed bump, it would cause your car to fly into the air.— SeñorChaCha
- When my wife was a kid, she used to think that highway speed bumps were for the blind.Anon
- I used to believe that speed bumps were dead bodies that had been paved over.— Natalie
- I always had to sleep with my feet under the covers or else speed racer would drive over them.Anon
- My older brother told me that speed bumps were really dead people covered in cement.— Trina
- I thought if you trip and fall down you fall at the speed of light!— Dietrich Corby