After a trip into the US, I was going through customs going back into Canada, and I got targetted for a random luggage check. So this rather amusing dude is going through my bags, and I happened to have little baggies of sea salt in my suitcase because I'd just had my philtrum pierced. He picks up a baggy and he asks, "What is this?!"
I blinked, pointed to my mouth, and was all, "Sea salt!! For my piercing."
He just chuckled at me and replaced the baggy. It was amusing after the fact, but my heart skipped a beat and I probably turned white when he asked.
Your story reminded me of that. :)