An absolutely classic hilarious joke or crooked poem

The king recruited Xu and asked the correct answer to his question to be his Xu. The topic is: let a cow shake its head first, then let a cow nod, and finally let the cow jump into the river. A butcher came to apply for a job. He asked Niu first, do you know me? The cow shook her head. He asked again, are you awesome? The cow nodded. Then he stabbed the cow's ass with a knife and the cow jumped into the river. The king wanted his daughter to marry a butcher, so he changed the subject: let the cow nod first, then let the cow shake its head, and finally jump into the river. The butcher is here again. He asked the cow, Do you know me? The cow nodded. He asked again, are you still awesome? The cow shook her head. He said, do you know what to do? The cow jumped into the river.