Ok, serious post time after my joke above:
I've not ever hit anyone, but I've come close with some shanked shots. But the craziest thing I've ever seen was when me and my playing buddy ran into some people we've played with a few times around the city when we've run into them. It's a guy and his wife. The guy has a decent arm, and we were teeing off on a hole that ran alongside another later hole. He griplocked the crap out of a Nuke, and sent it nearly 90 degrees right. There was a guy walking along the hole next to us, and it was headed right for him!
All of us were yelling "FORE! FOOOORE!," but he didn't take notice of us. That thing screamed across his chest, missing by maybe two or three inches. It was SUPER. FREAKIN'. CLOSE., and it had some heat on it. Luckily, it did miss, and all was okay. He didn't even get mad, and our acquaintance immediately went to him, apologizing profusely. It eludes me still as to why he wasn't mad, or even annoyed.
We joke that if he had thrown a Katana instead, it would have sliced the dude in half.