Ann Althouse passes along a great Groucho Marx anecdote (aren't they all great?) from Dick Cavett's blog:
The medium began to chant unintelligibly, and then to emit a strange humming sound (I can’t help seeing her as Margaret Dumont), eventually achieving her trance state. “I am in touch, I am in touch with the Other Side,” she intoned. “Does anyone have a question?”
Groucho arose and asked, “What is the capital of North Dakota?”
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