'Late Show' Guest Bill Murray Has To Start Training For The Marathon. Right Now.

Bill Murray Must Train For The Marathon. No, NOW.

Bill Murray appeared on "The Late Show with David Letterman" on Wednesday to promote his new film, "St. Vincent," when he decided, you know what, it's time to get ready for the New York City marathon.

Murray swiftly slathered on some Bengay, made his way out of the studio and into the streets of Manhattan for a quick run. Of course, as expected with most things Bill Murray-related, hijinks ensued.

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