I don't usually have that kind of OCD, but I know it is a common form of OCD. I sometimes have the 'what if I do something to hurt someone I love' OCD (for example, what if I go berserk and stab someone I love). I hate those stupid thoughts. When I have them I tell myself 'This is a meaningless thought.' And I envision a big STOP sign. Then I force my mind to think of something else.