The completely shocked expression on 5's face when he saw that he lost was the final straw that broke the camel's back.
All of the cheers and excitement that had disappeared from the people returned, making them jump with glee along with those smiles of joy that just wouldn't leave their faces.
This would definitely be a lesson that they would remember forever, and when the King made that comment, his words also got branded into their minds.
Throughout the show, his repeated appearances really had gone a long way in making him feel more and more familiar to all of the people who had used to think of him as some distant figure whom they didn't know much about.