I think back about it and the dumbest thing I've done while flying has been as an instructor. Sitting there for hour after hour while the person next to me tries to kill me (and him/her) time and time again, all with a smile on their face. When you finally get back and gently explain that some of the things they were allowing the helicopter to do were extremely dangerous, you get that look, and "yeah right", we made it back didn't we?????
Sometimes it is just as well it is difficult to get a gun licence in Aussie.
I do very little instructing now, I own several guns.....................