Watch Bill Murray jack a guy’s water while ‘training’ for NYC Marathon on ‘Letterman’

The inimitable Bill Murray appeared on the "Late Show With David Letterman" Wednesday night when only one minute into the interview, the comedian felt compelled to leave the studio for a training run.

"Can you handle things?" Murray asked Letterman after saying that he made a commitment to run the New York City marathon this year. "I really should get a run in."

Well he certainly sounds like your typical marathon runner. Watch Murray hit the streets in a tuxedo where he turns an oblivious bystander holding a bottle of water into a race volunteer.