I was sitting on a bench, waiting for my friend outside the Dupont metro, and I just opened up my book when a guy asked if I would mind taking a picture for him. I didn't mind, but I thought it was kind of odd that he wasn't standing next to anything scenic for the photo opp. It was just a street.
That might not be weird. I know that on the very few occasions my mom remembers to bring her camera on family outings, she take pictures seemingly at random. "Everyone squeeze in, get closer to that parking garage," things like that.
But sure enough, I couldn't get rid of the guy. I tried to subtly put on my headphones, but then he pulled out the ol' "Americans are the friendliest people in the world" trope and I felt guilty blatantly ignoring him. Oldest trick in the book!