Worst Mistake Made

So we all love Gordon Ramsey and we're huge fans of the show, but there has been times when he made some mistakes whether it came to challenges, dinner service, eliminations...whatever. So in your opinion, what are the worst mistakes Chef has made?

EDIT: Guys, please read the prompt correctly before answering, I stated this as Ramsey himself, not the contestants. We know the mistakes they made by now!