“Let me ask you,” said the man as we watched the storefronts roll by outside, “when’s the last time you shit your pants? While sober, I mean.” I took a moment to make sure I’d heard the question right, then said, “Don’t remember. Never?” “Then you’re a coward. You’re not putting yourself in situations that test your limits. You’re never away from the comforts of a restroom, never pushing your physical body or capacity for terror past the breaking point. You know who shits their pants? Marathon runners. Soldiers in battle.”