Lifelong Experiments I Didn't Realize I Did

Recently saw an article from @Voxdotcom that featured a Chronobiologist who counted off 60 seconds in his head 5-6 times a day, everyday and compared them to a regular clock. Then I realized I do weird stuff like that too, but not really for science.
  1. Crack every finger on my hands except for my life ring finger.
    I've done this ever since I can remember. My left ring finger is noticeably smaller than my right.
  2. Crap. I think that's it. Add your own below!