What is your favorite sales question and the best answer you've heard?

I don't have a favorite question but I do prefer open ended questions in discovery. Close ended questions start with helper verbs. Every question beginning with these words(Am, Are, Is, Was, Were) can be answered by a buyer with a yes or a no. Even when folks give you more than a yes or no they will always be giving you less than a response to an open ended question.

To get the most information and provoke deep thought from a prospect. I coach my team to leverage open and command open questions. For example questions that start with Who, What, Where, Why, Tell Me, Explain, Describe, Help me understand ETC. When you construct questions that are "open ended" buyers will elaborate and provide answers with a lot of detail.