Things you should NOT do at the field
The first day I ever watched an r/c plane fly at my field, a guy was doing low pass high speed fly by's. Trying to impress me and my two young sons, he was rolling knife-edge to knife-edge at 5 feet above the ground. After rolling 230 degrees instead of 180, he pulled up instead of down and a spray of white styrofoam covered the ground. I am surprised I didn't get a mouthful of transmitter after my naive comments. (ie what happened, can you fix it, do you crash often.....)
A few years later, I know better.......