I do this weird thing where I count certain numbers over and over on my fingers until I get to a certain other finger & then I stop. If I mess up, I have to start all over again. Like if someone says the number fourteen (it could be any number & I could get the number stuck in my head in all kinds of ways, not just by someone saying it), I'll become fixated on fourteen & have to count it on either one or both of my hands. If I count it on only one hand, I have to keep doing it til fourteen reaches the fifth finger, which is the pinky. It goes the same way if I count fourteen out on both hands, only it's a bit more complicated then. It's really weird, I know. I guess it might sound OCD related to some people (especially if I could explain it better-- because it does seem very OCD-ish), but it's not. I don't have OCD, but they say everyone has certain OCD-like tendencies, & that's one of mine.