A friend of mine told me that when she was little, she thought that the signs that say "no dumping" meant that people were not allowed to "take a dump" at that particular location. She wondered why people would want to take a dump outside in the first place.
A childhood belief about road signs

others believed things like this
- Someone told me People and fish went to the same place.I thought they meant humans get flushed— MrK
- Lightning and thunder were produced at the garbage dump.— penny
- I used to think that "No standing signs" meant that you weren't allowed to actually stand in the area!Anon
- I used to think that "cross-eyed" meant that people had X's for eyes, like dead people in cartoons.— Tim
- I used to believe the way they counted up votes was by counting the signs people used to put on their yards— Jaci Marshall
- My friend's sister believed the lyrics to Gazza's "Fog on the Tyne" were "Fog on the dinasaurs mine all mine"— Suzanne