Minnesotan Dave Mordal, who was a contestant on the show “Last Comic Standing,” will be hosting “Wreakreation Nation,” a show about the extreme ways people go to in order to amuse themselves. Here, Mordal takes on lawn-mower races, catfish wrestling and even a school-bus demolition derby. Mordal was back in Minnesota recently for the Tank Olympics in Kasota. It’s organized by a family that stages competitions with military tanks in their backyard. “Wreckreation Nation” aires Tuesdays at 9 p.m. on the Discovery Channel.