You know three triplets: Frank John and Wayne (need to return your money). Frank always tells the truth while John and Wayne always lie. You meet one of them on the road and can ask him a three-word question.

Which question, will you ask?

Are you John

Below will be the reply of three brothers:
Frank: No (speaks truth)
John: No (speaks lie)
Wayne: Yes (speaks lie)

Therefore if its Wayne then only you will get a reply as "Yes" and then you ask for your money.