Colorado Springs’ “Mad Pooper” saga has generated headlines across the world amid fascination and revulsion about a runner accused of repeatedly defecating on a family’s lawn. But it also brings up a topic many long-distance runners know all too well but can be reluctant to discuss: Sometimes nature calls at inconvenient times. “Inevitably, you’re going to find yourself out on the run and looking for the nearest facility and, unfortunately, sometimes the nearest facility is nowhere in sight and you’re pressed to make a decision sooner than you’d like,” said Paul Smith, a coach with Runners Roost Race Services. The urge affects everyone at some point, whether they are a casual fitness runner who may go out for 30 minutes several times a week or a runner training for a marathon, he said.