I've been pretty lucky thus far (knocking furiously on wood)....
I've had only 2 instances that recall. Once, last fall, someone hurled a black walnut seed pod at me. That hurt like mad. Another time, I was shot at by someone with a pellet gun. Does that count as getting "thrown" at you??
One time, when I was a kid, by brother and I got this grand idea that it would be fun to play catch with a dart. He missed and ended up with a metal dart stuck in his cheek. Needless to say, that ended that game pretty quickly!