Wayne Newton threatened to kick Johnny Carson's a$$.

Where was big Ed McMahon? Yes!!!!!!!!!!!!
Access Hollywood:
“I went to NBC, Burbank, and walked down the halls into his office, and Freddy de Cordova, his producer, was in the office with him. And I walked in, unannounced, I said to Freddy, I said, would you excuse us, please? He was so shocked that he did get up and leave,” he recounted. “And I said to Mr. Carson, I said, I don’t know what friend of yours I’ve killed, I don’t know what child of yours I’ve hurt, I don’t know what food I’ve taken out of your mouth, but these jokes about me will stop and they’ll stop now or I will kick your ass.”
Wayne said Johnny responded, claiming he was Wayne’s “biggest fan,” a statement the crooner scoffed at.
“I said, don’t give me that crap. Don’t give me that. I am here to straighten out whatever your problem is. And whichever way you want to straighten it out is fine with me,” he said.