A lot of my joints pop - starting from the bottom:
Knees, tailbone, spine, breastbone, collar bone, fingers, wrists, elbows, shoulders, neck.
This has always been the case for me. My collar bone really pops and I was never good at doing push-ups due to the repetitive motion (and popping). I think that I was dropped down the stairs by my sister as a baby....
I've never had a nosebleed. I've been punched in the nose too, just nothing gets that happening.
For that matter I have a hard time bleeding (which is usually a good thing). I used to donate blood though, and the nurses were always very concerned about the fact that it would take me 45 minutes to fill a bag that it too others 5-15 minutes.
I also always find myself getting head rushes, and have really learned to control myself when I am losing consciousness (I rarely fall, and even rarer do I black out from it anymore).
As for other things:
I am able to hyper-extend most of my joints and am extremely flexible.
I can make a perfect wookie noise, among other animals.
One eyebrow-raise: check.
Neck-cracking w/o assistance: check.
Ear purring noise thing: check.
Eye twitching thing: check.
1: Last year I was in a car accident and got a scalp full of glass. Last piece that I found was in November. Underneath my hair, there are some nice lines where there is no hair, and a good patch where the staples were
I also got a couple of bumps on my ear where glass cut into that (and since cartilage doesn't heal I can still feel the bumps), and a small slice over my nose and eye.
2: When I was younger I fell while running down a gravel road hill when we were camping. We were using my grandparents RV and they stocked it with a medikit from some ancient time. I was picking gravel out of that for a good long time too, but iodine was not the most pleasant antibiotic that could have been put on my wounds.