Watch Bill Murray Abandon David Letterman to Train for the NYC Marathon (in a Tux)

In the middle of his interview with David Letterman last night to promote his movie St. Vincent, Bill Murray decided to pull a Bill Murray and make things totally weird. All of a sudden, he seems to get flustered and begins asking Letterman questions like “What is today’s date?” and “When is the NYC marathon?” and “Is that soon?” He made a commitment to himself, he explains, to enter the race this year, and decides that he needs to get up and get a run in. “Can you handle things?” he asks the Late Show host.

Then Murray slathers Bengay all over his hands and heads out into New York City to train — all while wearing a tuxedo.

Watch the full clip here: