Was travelling with some friends in Istanbul. They were pretty inexperienced abroad, so I figured out public transit there, told them what tickets to buy, and we all walked to the ticket machine. There was a big line/crowd, and a guy up front was taking cash and giving people tickets, which he got by scanning a card at the machine. I went first hoping to show my friends what to do - bought my ticket for like €5 or so and ignored the scammer. They all gave the scammer guy like €20 for him to scan his pass and buy them a €5 ticket. Their reasons were “he seemed official” and “I knew it was a scam, but I figured it was just easier to go along with it”.