What's a small, weird habit you have that most people would never notice?

I've recently noticed that I always have to turn the volume to an even number, no matter what. If it’s on 21 or 23, I have to move it to 22. It’s a tiny habit that most people don’t realize I have, but I do it all the time! Does anyone else have a weird, little quirk like this that’s just part of their routine but no one ever talks about?