I used to believe that if you tried to buy something and then at the counter realised that you didn't have enough money you could go to jail.
A childhood belief about criminals

others believed things like this
- I used to believe that when i didn't get money from the toothfairy she was in HawaiiAnon
- I used to believe that money really did grow on trees, but grownups just didn't want us to know about it.— Mariah
- I used to think that if someone gave you acid, you could completely counter the effects by taking an antacid.— abracadaver
- that people in shops gave you 'change' if you didn't quite have enough money to pay.— suzy
- I used to believe that you could create money (that you didn't previously have) by writing a check.Anon
- When I was a little kid I used to believe that tissue paper was money and that you could have a box of money.Anon