A few years ago, I got taxi scammed in Shanghai, from the Maglev station to the Bund. The guy had some kind of rigged meter, and quoted me a fixed price in advance which seemed high. I figured I'd have the hotel bellman help straighten things out upon arrival, but then I got the "I can't go into the driveway" part of the scam. Interestingly, it appeared at first glance to be a legitimate taxi, with markings, the security panel, and very worn sets of the stickers with official announcements and rules posted. Looking back on it, I suspect that it at one time was a legitimate taxi, but one that had been taken out of official service and was now used as a gypsy.