I took one in the eye, not too many years ago. Funny thing is, I had been fairly careful about wearing safety glasses during 'dangerous' operations, but I didn't really notice exactly when it happened. But Boy, the next day I knew I was in trouble! Woke up feeling like someone had substituted a boiled onion for my right eye! Lots of fun, driving around with ny good eye closed, trying to find an urgent care clinic (turns out they have all closed in my area). Finally found an ER that only had a one hour wait.
ER doc pulled out three separate slivers from my cornea. However, they had already started to rust, so the next day I had to go to an ophthalmologist. He used a tool that looked remarkably like my Dremel to grind away part of the cornea. Not as bad as it sounds, really, but still memorable. Hurt for 3-4 days, took a couple weeks for my vision to clear up completely.