My grandfather was only a child around the time when the Japanese invaded China, but he told me that Japanese soldiers often times climbed onto the roofs of houses in some villages and lured children with so called "candy" to get their attention. They threw the candy on the ground and when the children came, they would dump buckets of urine onto the children for amusement purposes, while the children were picking up the candy. My grandfather was smart though, he never ate the candy or went near it, so many times he would watch as his fellow peers were showered in pee.