Oh so many weird things, though bearing in mind I have a totally knackered spine and shoulders (stenosis, cervical, thoracic and lumbar it would appear)...
Depending on how I sleep, I may irritate nerves that serve my hand/fingers - usually that results in half the hand or two and a half fingers being numb. Half a numb finger is very odd!
Currently I've annoyed the median nerve and so it feels like half my thumb is ice cold and someones trying to drive a nail through the lower part of my palm. Ouchy.
A few weeks back something in my back went and I had the feelings of trapped wind for three weeks solid, affecting bladder and bowel sensation, control etc etc.. then something went 'twang' internally and it all instantly went back to normal. The twang itself was actually rather pleasant!
My femoral cutaneous nerve is duff, both sides now - that can feel like pain or it can feel like crawling sensations, like bugs walking on me, or like someone pouring water down my legs, or again as if some areas are ice cold. On touching those areas, they're kind of numb, ish.
More normal stuff... stabby fanny, shooty bumhole, spikey clit, half-numb-bum, all pretty regular stuff.
If I am very hungry i get a weird clicking sound in the back of my neck, others can hear it if they put their ear against the back of my neck.
I've got a patch of long black hairs growing up ONE shin, no idea why and the rest of my leg hairs are a light brown. No specific injury to that area.
I have a scar on my back where I had a mole removed, it itches, but the actual itchy point is somewhat further down and sometimes I have to get DP to hunt for the itchy point as it moves, but its all linked to the scar.