Wow, now my comments inspire threads? I'm flattered
Anyway, papercuts hurt like hell! They look so tiny and insignificant, but they can pain you for days, especially if you have to deal with salt and have no way to mend it (it happened to me).
Another thing that happen to me quite often is the tendons of my feet getting tangled, thos freezing the toes in an unnatural and extremely painful position, causing cramps to the muscles. I have suffered from this since I was a child, and now my nerves are so used to that pain that I barely cringe when it happens. I even stimulate those cramps myself picking up pens or books with my toes.
I know, I'm a freat and masochist