For me I have to turn around if I drive over a manhole and hit the left side as opposed to the right because I am convinced I will get cancer if I don’t. I also have to turn a lightswitch on and off six times. I avoid cracks because in my mind cracks lead to cancer. I often take Benadryl out of fear of an allergic reaction to any new food when I never used to do that. OCD just makes things shit.