Lü Dongbin
Lü Dongbin, one of the Eight Immortals, disguises himself as a "tangyuan" vendor at the Broken Bridge near the West Lake in Hangzhou. A boy called Xu Xian () buys some "tangyuan" from Lü Dongbin without knowing that they are actually immortality pills. After eating them, he does not feel hungry for the next three days so he goes back to ask the vendor why. Lü Dongbin laughs and carries Xu Xian to the bridge, where he flips him upside-down and causes him to vomit the "tangyuan" into the lake.