According to falkin,a therapist for obsessive compulsive disorder,OCD is unlike other compulsive such as eating or drinking, where people get some enjoyment out of them.When people with OCD engage in compulsive rituals,they never report getting any enjoyment out of them,but instead feel driven by their obsessive thoughts."Subjective personal distress is the No.1 criterion for OCD,"Falkin stated."People who have OCD are aware that they have a problem.They know their behavior is irrational,but they can't help it.As Cindy,one of his patients,said,she knew it was stupid,but her mind wouldn't let her stop.