Unfortunately, at some point or another, everyone gets duped or at least encounters instances that are truly bizarre.
Years ago in college, a friend moved to St. Louis with her family, but she frequently came back to visit. On one such visit, another fiend and I went to pick her up from Union Station where she was taking the train in, but before we got into the building, a quick-change artist approached my friend and scammed him out of ten dollars by asking him to break a ten and quickly shuffling around bills until he was out the ten bucks.