I used to believe that the 'Blind Driveway' signs mean that a blind person lived there so you better watch out because they might just walk (or drive!) right out in front of your car.
A childhood belief about road signs

others believed things like this
- I used to believe that blind dates were dates for people who were blind.Anon
- I was told that if you went to brd with your sox on you would go blind.— Frank L
- i used to think that if you were blind you had to have your eyes closed. Anon
- I used to believe that if you were blind you could wear glasses and you'd be able to see again— Jane
- I used to think that if you closed your eyes, you convince others that you were blind.— katie B
- I used to believe if you read a book in the dark, you would go blind.— Ellen