I'm super OCD, so lots of things, particularly related to organization or sports-related superstitions. One weird one is how I fold towels. My mom gave out lots of chores when we were kids, and she was VERY particular. I learned there is only "one way" to fold a towel. So when my wonderful GF was so kindly folding some clean laundry I had in a basket, I felt terrible re-folding the towels in front of her. The GF was telling that story at my brother's wedding, and my mom was like, "I'm so sorry, that's my fault." But then my grandma piped up, "no, that's my fault." Apparently I come from several generations of anal towel folders...