Long ago, when I was about ten or so, my parents or grand parents took me to the local airport. A model flying contest was going on, with the spectators separated from the control line circle by a chain link fence. Adjacent to the spectator area was a small parking lot reserved for the control tower personnel. A somewhat old Studebaker (had a split front window with a center post) was parked in the control tower lot.
A metal pan speed model was being flown tethered to a post, and the pilot had a a control handle. The metal mono-line snapped, and the model went through the metal cyclone fence, and hit the Studebaker's windshield center post. From the damage, it might have gone completely through a person. That was the last model airplane contest held at that airport.