How Do You Stop a Compulsive Talker?

How do you stop a compulsive talker? Giding a seminar or something like that is always a challenge. What's the strangest question anyone has ever asked you? I think that everything is its gamei haven't herr ah, no, no, a coming. That jump. Ok, good jump. Gotme. Bot, thats the most despairing answer to that question i've got yet next.