I used to believe that when you paid tax on a purchase, you paid extra money because you didn't have any tacks to pay, and that the cashier took the money and bought the tacks themselves so they wouldn't get in trouble with the IRS.
A childhood belief about going shopping

others believed things like this
- I used to believe that you had to "buy" your job. The more money you paid, the better the job. — Duke
- That everything was free. You paid for nothing, money was just to look nice.— Blasia M
- I used to think all money paid for goods at shops went to charity.— Tim
- 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
- I used to belive that if you went up to an ATM it would just give you money out that is not your own money.Anon
- I used to believe that when i didn't get money from the toothfairy she was in HawaiiAnon