Before 2001, when x-rays were relatively new, I got stopped at security. Three very LARGE gentlemen showed up and I was whisked to a private area along with my little carryon. I was perplexed and frightened when the agent in charge said, "Ma'am, it is illegal to carry firearms."
My response was, "Huh? I don't own any weapons?!!"
Turns out that in my small cosmetic case, a round compact and a tube of lipstick had rolled together. On the screen, it looked exactly like a derringer. The agents were very apologetic when they opened the cosmetic case and discovered the "fearsome" rosey lipstick and little compact with a jewelled kitten on the lid.
We had a very good laugh. They were sorry to have scared me and I was happy that they were doing their job.
Nowadays, I'm not sure there would be as much levity.