Whenever Lois Pile hits the road, she also thinks she's hitting people on the road.  She truly believes this.  Lois is constantly looking around, checking the mirrors, anticipating a catastrophe that never happens.  Lois' real problem is not her driving.  Instead, Lois suffers from an illness, a form of obsessive compulsive disorder 'harming obsession,' and in her case, Lois is afraid she's going to run someone over.  ABC News speaks to several OCD sufferers who have a chemical imbalance that manifests in intrusive thought patterns.This "20/20" show contains the following additional stories:Vigilante HeroTexas StandoffThis product is manufactured on demand using DVD-R recordable media. Amazon.com's standard return policy will apply.