How to Save Your Unhittable Pitch for Important Moments

Can you save up your unhittable pitches and then roll them over to the postseason? It would be cool. I mean, we'd all be like waiting and wondering if this is going to be the unhittable pitch or like you'd be mad at him if he didn't use it at a moment. Like what's the leverage threshold where you should be confident that you're not going to get another comparable situation?"