I got hit in the head by a thrown bat during a spring training game at Tempe Diablo when I was in high school. Phil Nevin struck out and on his swing-through let go of the bat and it spun into the stands. I was sitting in the first row behind the dugout and I had the spinning bat judged, but it changed trajectory as it skimmed off the top of the dugout completely missing my arms, and it hit me square between the eyes and cracked one of my orbital bones. I just remember losing a few seconds of memory from the trauma, looking down and being really annoyed that my shirt was covered in blood, and literally asked "ok, who the hell is bleeding on me?!" Meanwhile, my dad was next to me cussing up a storm in panic. He doesn't handle traumatic stress well...
I remember JT Snow popping his head up out of the dugout (it was a Giants-Angels game) and giving me a towel to clean myself up. The next day I went to a Giants game in Scottsdale and talked to them after the game. JT was really excited when I told him who I was. And a year later I approached Nevin while he was flirting with a girl after a game, he realized who I was, panicked, and literally ran away.
If it hit an inch or two off to either side it would have likely blinded me in that eye, or worse.