When Ni Ping visited Mengcheng, he was served a dish of bullwhip, which tasted particularly good. He asked, "What is this?" Feng Gong replied, "It's on the cow's skirt." The cow's skirt said, "It's also on Feng Gong." Ni Ping asked, "Do I have it?" Both answered together, "You sometimes have it, and sometimes you don't."
Note: This translation preserves the humor and wordplay as closely as possible, but some nuances may be lost between languages.