Joan Rivers & Johnny Carson
Joan Rivers and Johnny Carson were always friendly back when Rivers used to guest-host "The Tonight Show." In 1983, Rivers became a permanent guest-host for Carson for the next three years. After doing really well on Carson's show, Fox offered Rivers her own late-night talk show, which she accepted. Carson reportedly became furious after Rivers accepted the position because she never sought his advice and had to find out about her show via televised conference. But Rivers denied that was ever the case.