While I don't have OCD, I do have a few quirks. For example, when I use an ATM, I touch the keypad with my knuckles instead of my fingertips. For some reason, I think that doing it that way will protect me from norovirus particles. Even though the chance of catching noro from something like an ATM keypad is extremely small, I always think that a sick person with unwashed hands might have been using it right before me.