From Accidental Fame Junkie. I'm not sure what counts as "weird."
1. AFJ may talk to herself, but I sing to myself. All the time, not just in the shower. When inspired, I change the words to whatever's in my head to suit what I'm thinking about. My mom does this too; whether nature or nurture, I think I know its origin.
2. Related, I love to sing along to movies or CDs, and if I don't know the words, I will look them up online and sing with the computer in front of me. I also sing along to classical music with the score out, usually Handel's Messiah.
3. If I'm thinking about how to phrase something, I ghost type it - that is, if I'm not in front of a computer, my fingers still move as though I'm typing what I'm thinking. I attribute this to ten very formative years of piano lessons.
4. Dirty dishes have to go immediately into the dishwasher, not into the sink or on the counter. Right away. And they have to go in a certain way. And the silverware should be sorted as it goes in - one cubby for spoons, one for forks, etc. This last one is pragmatically inspired, since once the dishwasher is done I can just pull one group at a time and put it into the appropriate space in the drawer (because of course I have one of those silverware sorty things in the drawer, with a spoon-shaped area for spoons, etc.) Wow, now that I have written that out, it sounds even weirder.
5. Things that find their way into my car or on to my front porch often do not resurface for months, even years. Both of these areas are supposed to be temporary. In the car, something is in there only if it is needs to be taken from point A to point B, and once the car is back here, the item should go back in the house, but this rarely happens. The porch is similar; usually something goes there because I need to find a more permanent home for it elsewhere but the porch will have to do for now. "For now," she writes, laughing. I put my down comforter out there in April to air it out before folding it carefully and putting it in the closet for the summer. It's still there. I will say, though, that there were some chilly nights in early June when I was on my hammock on the phone and I was really happy to have that comforter in arm's length.
6. I have very strong feelings about when to use capital letters - the less often, the better. Whenever I am asked to edit somebody else's writing (which is often, since that's part of my job), I get really annoyed by things that I think don't need to be capitalized. Like "Internet." I hate that.