I was cutting through the RLD in Amsterdam, which is pretty tame at midday. I was behind an American couple heading down one of the narrow alleyways. I noted that the gentleman was wearing cargo type shorts with the right side pocket bulging with what could have been wallet? passport? I said, excuse me, but you might want to keep an eye on that pocket. He immediately snapped back at me "I KNOW!"
Perhaps he had nothing of importance in his pocket, but I don't think there is any excuse to be rude. His wife looked appalled, btw.
Should I have said nothing in the first place? My mother always said "no good deed goes unpunished".