The Barkley Marathons: The Race That Eats Its Young (2014)

The funniest documentary here, about the cruelest race. Gary Cantrell, who goes by Lazarus Lake, runs the Barkley in Tennessee's Frozen Head State Park: five laps, closer to 130 miles than 100, a 60-hour limit, a $1.60 entry fee and a license plate from your home state or country. In its first 25 years only 10 people finished. Annika Iltis and Timothy James Kane let the eccentrics talk, and the result is laugh-out-loud funny and oddly moving. Show it to friends who think runners are crazy.