The “wait” that precedes the “what” could be seen as just a useless rhetorical tic. But I think it’s crucial because it reminds you (and others) to slow down to make sure you truly understand. Too often we fail to pause for clarification, thinking that we understand something before we do. In doing so, we miss the opportunity to grasp the full significance of an idea, an assertion, or an event. Asking “Wait, what?” is a good way to capture, rather than miss, those opportunities.
"Wait, what?" is important to clarify the question which helps us to get to the heart of the problem

