Besides death while fishing, the worse injury I have heard of was a flying gaff the went into an anglers face and came out just below his ear while at the canyon 130 miles offshore. (heard it on the VHF radio when I saw the CG jet and helo making the run out to help them) It was one of those new " top shot" styles
http://www.anglerscenter.com/acc_topshot_flyingaffs.htm
Personally, beside numerous hand injuries my worse was two sets of trebles in my face with one in my eye while fishing at night (2:00am) by myself at SW point BI in November...a long time ago. I was freakin cause the plug was still attached to my line and I couldn't walk back easily without falling, my eyes were shut. It was a nightmare...it turned out OK but at the time i thought I was going to be blind in one eye.