My whole body cracks (according to my boyfriend). If I don't crack various part of my body (back, wrists, fingers in particular) they start hurting.
I sneeze when I pluck my eyebrows (I guess there are some sensitive nerves around there).
My legs and arms are slightly longer than an average person. Not that I notice since this is how I am, but people have been pointing it out all my life. Makes it hard to find pants though.