I bent down to pick up a pair of socks I had dropped, way back in high school. When I snatched them off the ground, a splinter about half an inch long or so went underneath my fingernail of my left hand ring finger. It came out the back about a milimeter down from the nail bed. That may well be the most painful thing I've ever experienced. When they talk on tv or movies about shoving bamboo shoots underneath your fingernails, I know exactly how that feels.
When I finally stopped jumping up and down and cussing enough to grab it with some tweezers and try to pull it out, it broke off about halfway down underneath my nail. It was a terrible week until that thing came out I tell ya.