I like to think that dh is the OC in our family. ; ) But I admit I have my own little quirks too. Problem is I can't think of any really good ones right now, & neither can dh (I asked).
The only one that's coming to mind at the moment: whenever we're in a bookstore, I will often straighten up the books -- including shoving in the ones that are sticking out too far, & reshelving ones that are out of alphabetical order (drives me nuts).
I also hang dh's shirts (& mine) in the closet grouped according to colour. He thinks that's weird. I think it's just because he's male. ; )