Obsessive Compulsive Disorder AKA "OCD"- People suffering from OCD use ritualistic and repeated behaviors to rid themselves of obsessive thoughts and anxieties.
People with OCD have thoughts that they may feel they cannot control.
People With OCD may be obsessed with germs, or dirt, so they may wash their hands over and over.
They also sometimes have thoughts of violence, and fear that they will hurt people close to them
Some people obsess over a door being locked, or the stove being turned off.
When these people don't do the rituals that they are drawn to, then their anxieties get worse until the rituals are performed.