I frequently carry a jeweler’s loupe. A while back a co-worker asked me if I had a magnifying glass because she was looking at some spots on a reprint of a rare book. I offered her the loupe. She looked at it oddly, looked at me, and then said, “Okay, I’m not gonna ask.”
Now why did she think it normal that I’d have a magnifying glass but weird that I had a jeweler’s loupe?