I thought when people said debit (like a debit card) they were trying to say "debut" and didn't realize the T was silent.
A childhood belief about speaking

others believed things like this
- I thought a Debit card was actually called a Debt card.— Kilgore
- I thought that a travel visa was a special credit card which was used for travellingAnon
- I thought that a "student visa" meant to use a credit card while travelling.Anon
- My mom would tell me to stay off the railroad tracks because the trains were silent and super fast.— Roger
- I used to believe that every religous Christmas card we recieved was sent to us by God.Anon
- I used to believe that with a credit card, you could get anything you wanted for free.— Anonymous