There are several types of obsessive compulsive disorder. There are washers who are afraid of being contaminated and clean or handwash constantly. There are the checkers, people who constantly check to see if the door is locked or if they turned off the stove. There are the doubters and sinners who are afraid of doing something wrong. They think that if they do not do everything right or if something is not perfect, that something terrible is going to happen. Counters and arrangers, these types are obsessed with order and symmetry. They may have superstitions of numbers or colors. Then you have your hoarders who do not throw anyhting away and feel like something bad will happen if they do.