How about myself and my best friend go out to the range with several firearms, including his girlfriends first gun. We got to the range and began shooting. We shot our pistols for a while. We then shot his girlfriends gun, I went first, loaded it and fired a mag. of ammo. He loaded a second mag. full of ammo and the first time he pulled the trigger it went "click." This was due to a broken firing pin, on a pistol you can not get parts for anymore.
We had quite a time explaining what happened to that pistol when we got back to his house. The running joke to this day is that "he broke your gun" while pointing at the other guy.
On another trip I ran into a problem of forgetting to bring staples for the backboard. The range is about 30 minutes from anywhere you can buy staples, and there was no one else at the range. I had to make due with electrical tape, and wood screws.