Once I was setting up my 8x10 (a Calumet "Black Beast" - not a moniker lightly given) and I noticed a young lady of perhaps 17-18 years of age standing off at a respectful distance. She had a DSLR of some sort with a longish lens sporting one of those tulip hoods.
When she put it to her eye and pointed it at me, I suddenly realized I was getting a taste of my own medicine. I did my absolute best not to laugh at the delicious irony and thereby ruin her efforts. I figured her to be a high school student working on an assigned project, so I just continued on as if she wasn't there.
You know, John, honestly it didn't bother me one bit. More than anything else I took it to be a "My Name Is Earl" moment where karma was most definitely kicking my photographic ass. And given the number of times in the past I have been her, I figured the most appropriate thing to do was just to suck it up for the greater good and play the Crabman.
After getting a few of me setting up, and later under the darkcloth (good for her to know enough to realize that this particular visually defining moment was coming, and then wait for it), she disappeared. I made no attempt to acknowledge her, nor she I. In spite of my curiosity, I felt that to also be part of my appropriate response.
Hopefully we both walked away with some interesting photos. At least I thought mine were.