I bite my nails, but I always make sure they look ok, by biting off the bits that are jagged. They end up looking like nails that were clipped a day ago by a nail clipper.
I also push back that little bit of skin that covers the bottom of the nail. Not too hard, I just like to barely see it.
I also crack my knuckles and other articulations a lot. When I go through a complete "cycle", each finger goes through 3 cracks (in different places), my wrists once or twice each, my elbows twice each, my neck once, my upper back, then lower back, my hip if I can (sometimes it works, sometimes it doesn't). My knee can crack by twisting it, or extending my leg, and this sort of dislocation-ish thing, that produces a very loud low pitched crack (everyone I've shown this to gets freaked out, nobody else can do it, or wants to). My ankles, and then my toes. I don't always go through this specific order, but sometimes I do, to the great annoyance of however is hanging out with me.
Other than that, nothing that I can think of.
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