Dogbert: "You should hire me as your management consultant."
Man: "We're a management consulting firm. We don't need a management consultant to consult us."
Dogbert: "Are you saying that management consulting is worthless?"
Man: "No, I'm saying we already know everything about management consulting."
Dogbert: "How can you be so sure I can't help you when you don't know what my advice will be?"
Man: "Okay, you're hired. What's your advice?"
Dogbert: "Beats me. I'll have to ask my management consultant."