"Could I have your autograph please?"

Somewhat distracted, I wrote my signature on the cardboard beer-mat that he presented me. And off he went. Why? What could I have possibly done to arouse admiration or another feeling? My letter did get published, but the chance that it is about that, is zero. Soccer trophy from the first grade, a small part in the school play... nothing worth mentioning. Did he think I was someone else? My brain kept rattling on, and I came to the conclusion that this man probably randomly asked for autographs.