My sister is diagnosed OCD. I like to torture her. When i visit, i like to nudge things out of alignment and see how long it takes for her to completely subconsciously realign things. It only takes a couple of minutes. Of course, now she expects me to do it so she finds things faster, but it is amazing to watch her.
When we travel, we send postcards. On hers, the postage stamps go on crooked or upside down. Makes her all sorts of crazy!
