I had one land on the roof of my teaching center last week. What's so amazing about that?
The building was directly behind the player!
Back in the 80's a playing partner of mine about took my head off accidentally about the same way. I was directly behind to watch the ball since it was almost dark. He hit a bad shot and went to send the offending club toward the green. It was a hot day and between a wet glove and tacky new grips, the club came twirling backwards over his shoulder and went right by my head!
When he looked back, he was as white as a ghost! I'm sure he thought I was going to be laid out on the ground. I expect I was pretty white, too!
Lesson: know where to stand when clubs are going to be thrown! (and apparently, the roof isn't safe either...)