Around 1,250 years ago, in a town in Nanjing, China, there was a salt seller who had twin teenage daughters. In need of money, he sold his daughters into marriage to much older men, both of whom were miserably poor merchants. The daughters so hated their husbands, and were so enraged at their father, that they committed suicide. The townspeople worried that the twins, having died with such a bitter grudge, would return as vengeful spirits. Just in case, they buried the twins in fertile land and erected a tall gravestone to honor them, hoping this would ease the grudge.
Apparently, you don't want to go near it. Recently, a 62-year-old man dug up a portion of the grave, hoping to use the fertile land around it to sow crops. He quickly fell sick, and the townspeople convinced him the only way to restore his health was to repair the damage he had caused. He did as they said, and it worked. Many in the town believe that, by performing regular maintenance on the tombstone, like wiping dirt off it and picking the surrounding weeds, you will earn the twins' blessing, which will cure sickness and fatigue.