I'm not sure I do these things because of my OCD (perhaps some of them are tics or something) but here are some examples of things I do:

1. I obsessively re-read and edit things I've posted in forums like this or things I've sent in an email etc.

2. Sometimes when I type things it just doesn't feel right so I then erase what I've written and write the exact same thing again until it feels right. I quite often erase full stops or commas, for example, and write them again a few times.

3. Every time I watch a video or read a post like this (etc) I need to move the arrow (the one you move with the touchpad/mouse/whatever, not sure what it's called in English) to the right side of the screen. I move it with my right index finger on the touchpad but then I often feel uneven and need to even it out by moving my left index finger from left to right on the touchpad as well.

4. I save documents a lot and I worry about not having saved them. I also worry that the format of documents I'm sending in to a professor/teacher all of a sudden change, so that the person who's supposed to read it can't read it and I'll fail. So I check the format over and over and over again before sending the document.

5. Sometimes I get the urge to right-click (and I have to do it to get rid of the strange feeling I then feel in my fingers). I do it a quite few times in a row which sort of annoys me because if I do it quickly I sometimes accidentally press "back" (which is the top option when I right-click), which means I sometimes press "back" in the middle of a youtube video or something.