That is kind of like the time I brought my .357 Trooper to school-with permission from the principal, but the guy who asked me to play a 'robber' so he could demonstrate his disarming' Tae Kwon DO moves for a class we were in didn't know about my 'surprise'.
The principal held on to the gun until I needed it for the class, then he decided to stick around and watch the show.
So Mr. Tae Kwon Do and I square off, me in the typical dumb robber stance, him in a stance that telegraphed the roundhouse he would attempt long before him foot left the ground. He started his spin, I stepped my right leg back, pulled the pistol into my side in a retention position, and pulled the trigger. The only two people who knew that I had primed .38 Spl. brass in it were the principal and I .
The Look on the martial artist's face was priceless, and I turned to the class and said, "And that is a good demonstration of why you shouldn't attempt to disarm someone unless you have been
properly trained." (I actually had been, as my Dad and I worked on retention/disarming regularly at the time, because I was going to take LawE classes the next year, and it was good practice for him, a St. Paul cop.) That guy would not talk to me the rest of the year, and apparently the lesson didn't sink in, because on a class trip to Anaheim, he wanted to take on three Marines fresh out of boot.
His girlfriend and her best friend talked him out of it....