At the Phoenix concert on May 19, 1979, people were tossing around a frisbee during the show.
At one point someone flung it up at the stage toward Ray, and it sailed toward his face and smacked him hard on the flute. He was intently playing and didn't see it coming - there was a loud squelch. Ray kept gamely on for the rest of the concert, but he was pretty angry. I was lucky enough to get backstage at that show (there was a full meet-and-greet back then) and when Ray came out, one of the first things he talked about was how that guy had dented his flute.