Here is one way it can be traced, innocently enough. When I was a kid (I was less than ten years old), I was at a charity softball game. Got a bunch of autographs, leveraging off other people's pens, etc. One autograph I got was in pencil. After a few years, the pencil autograph faded. I took it upon myself to "enhance" the autograph with a pencil so I could see it better.
End result is one autograph on the program is enhanced, and the others are in pen, untouched.
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