Many people say that cats hold grudges, but in fact, it's not just cats that hold grudges. Take Qi, for instance, the clown.
He probably remembered the previous unpleasantness with Zheng Tan, or perhaps Qi didn't feel right without stirring up Zheng Tan. When Pei Liang brought him to visit the Jiao family, Qi, dressed in his new "Great Sage Equalling Heaven" outfit and wielding his "Jingu Bang", performed for the Jiao Family. Then, with a "slip of the hand," he knocked Zheng Tan's water bowl off a nearby chair onto the ground.
The Jiao family's living room was not big, and Jiao Ma had moved Zheng Tan's usual chair aside to prevent it from getting smashed while watching Qi perform with his staff. Despite that, it still got hit.
This clown monkey then hid behind Pei Liang looking very uneasy about his mistake, while Jiao Ma repeatedly comforted him, saying, "It's okay, don't worry about it."