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Conan O'Brien, being the crazy funny guy that he is, actually attempted to ride a water buffalo and not surprisingly, was injured doing so!
Turns out the guest on the show was an animal expert, who brought along a water buffalo as the big finish. Unfortunately for Conan, a member of his staff, who remains unknown, suggested that the late night comedian actually mount the wild beast and try to ride it.
After showing the clip of himself falling from the animal to the hard floor below, Conan explained the incident didn't leave him unscathed, dishing on his battle scar, calling it, "the greatest bruise of my life." Then he did the unthinkable... dropped his pants and shared his bruise with the world.