if one hand gets wet, i like to get the other one wet too, otherwise it feels too dry after.
i usually make sure the LAST thing i do of everything is a good one.
i don't like leaving feeling as if i cheated myself.
I do that last thing too.
I ALWAYS put in my right eye contact before my left. Same when I take them out.
If I'm taking a test or writing a paper, and my hair is down, instead of putting it behind my ear or something I hold my hair in a ponytail at the back of my head for the entire test. I don't realize I'm doing it, but I probably look ridiculous. So, my next quirk I guess, would be that I put a hairtie in if I need to think.
If I eat a sandwich while I'm talking, I flip it around in my hands and take bites from it horizontally, vertically, or backwards. It annoys people but once again, I don't notice I do that.
This isn't really a quirk, but: every summer I braid myself a necklace and some bracelets, and each one is "dedicated" in a sense to a certain part of my life. I wear them the entire summer, and get sad when I have to take them off because I get attached to them and feel closer to what they represent when I wear them. It's super cheesy but I've done it for years and it makes it feel like summer.