I'm sure you've all been there, in that huge meeting where everybody punts on the details and leaves it all up to you. You, diligently, take up the reins and make bold, forward thinking design decisions. You then make a fatal mistake, you go back to get approval from a group that wanted no part in making those decisions. You must now pay the penalty.
Pro Tip: When going back, it's best to "inform" rather than seek "approval."