20/20 S2010E33 - July 23, 2010

Washington Redskins Cheerleader Ambassador Desiree Jennings, 25, had everything going for her until one day her body suddenly stopped working, turning into a twisted, jerky mess. For some inexplicable reason, when she runs, Desiree's body untwists and straightens out, and sometimes she can walk backwards and sideways without trouble. Footage of this unusual phenomenon spread quickly online, making her an internet sensation. Was it caused by a flu shot, as Desiree thought? Her journey for answers to this medical mystery takes her to a controversial osteopath in North Carolina and ultimately leads people to question whether or not her affliction is real.