This is a joke on mustard day.

While eating, Master Maya predicted the future, and the disciples next to him recorded it devoutly. When the calendar turned to 20 12 12 2 1, the master suddenly ate something spicy, sweating on his head and his face changed greatly: "It's mustard! Day! " Disciple wrote down sadly: "20 12. 12。 2 1, the end of the world. "