Wang Xizhi's handwriting is so good that couplets are posted outside the door on New Year's Eve. He wrote n couplets, all of which were stolen. So he wrote a pair:
It never rains but it pours.
So unlucky, of course, no one dares to steal.
Unexpectedly, in the end, he asked his son to give it and added three words at the back, thus forming a wonderful couplet:
Until today, there has been no double happiness, but last night it never rains but it pours.