Some people jog. Some people power walk. And then there are those who've committed their entire existence to moving through life in reverse. Today we're counting down five individuals who turned walking backwards from a quirky hobby into an all-consuming way of life—including one man who hasn't faced forward in over 40 years.

Between 1978 and 1980, a man nicknamed 'Monsieur Mangetout' literally ate a Cessna 150 aircraft—piece by piece, bite by bite. We're diving deep into the bizarre true story of Michel Lotito, his iron-lined stomach, and the psychological and physiological mystery of how someone becomes fixated on eating the inedible.