Chong Cha is actually made from the droppings of certain caterpillars. In Chinese literally call it "worm tea".

 Cited from The Food Insects Newsletter,  The Research Institute of Insect Resources in Yunnan Province, China. (information come from en.wikipedia.org)

"A study that will not sound too appealing to many Westerners is on the presumed health benefits of Chongcha, a special tea made from the feces of Hydrillodes morosa (a noctuid moth larva) and Aglossa dimidiata (a pyralid moth larva). The former eats mainly the leaves of Platycarya stobilacea. the latter the leaves of Malus seiboldii. Chongcha is black in color, freshly fragrant, and has been used for a long time in the mountain areas of Guangxi, Funan and Guixhou by the Zhuan, Tong and Miao nationalities. It is taken to prevent heatstroke, counteract various poisons, and to aid digestion, as well as being considered helpful in alleviating cases of diarrhea, nosebleed and bleeding hemorroids. Whatever the extent of its preventive or curative benefits, Chongcha apparently serves as a good "cooling beverage" having a higher nutritive value than regular tea."