He has not been back on the show in a loooooong time. And I remember JJ talking about how there was a certain comedian who was supposed to go upstate New York with him to do stand up, and he said yes, but then he talked to his agent and then demanded more money. He said he wouldn't air out who it was, but that we all more than likely knew and that it damaged their friendship.
So is this Tom or am I thinking about someone completely different?