The first time I ever met Stephen King, he came up to me, and we went to shake hands, and he had, like, this fake rubber rat that he kind of, you know, shook at me. You know, and I said, 'No, this is a cliche - this can't be. Stephen King is trying to scare me with a fake rat?' It was just really weird.
You can't pretend to be witty because wit is dry, subtle, lacerating, cynical, elitist, and risque - all impossible to fake. Humor, on the other hand, is broad, soothing, positive, inclusive, and smutty - to make sure everybody gets it. Pretending to be humorous is easy, and a great many people are doing it.