I was spotted.
I used to deal with this using the technique of holding the position or tracking slowly and pretending to shoot other things just behind or to one side of where I had really been pointing, hoping that the subject would assume they'd inadvertently wandered into shot or they were mistaken and weren't the target of my photographic affections anyway.
But that was before I discovered Brick-In-A-Sock (tm) and its amazing memory-wiping ability. Now, with Brick-In-A-Sock (tm) I'm free to shoot who I want, where I want, when I want, how I want, safe in the knowledge that anybody who looks at me funny won't remember a thing the following day.
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