I had a worse experience last weekend.
My club's flying field has a nice engine start-up area which is about 60 feet away from the runway.
While I was flying in my pit, this one guy brought his plane to about 10 feet behind and working on his engine.
It was about 90 size pattern plane with big YS engine. He was going full throttle, holding the plane with one hand(airplane facing directly at my butt)
and playing with transmitter with the other hand. I got pretty nervous and I could hear anything except his engine.
His engine kept dying(I don't know why) but he kept during for my whole flight time(about 10 min).
I didn't say anything but gave him a dirty look. Well, I think he got my msg because I brought his plane
back to start-up area and work on it there.