Best I can think of is when I first arrived in SVQ for a semester of studying, the taxi driver ripped me off for an extra 15 euros. I was too tired and taking everything else in that I didn't really realize how bad it actually was with the exchange. I'm pretty sure I still remember the license plate of that asshole 3 and a half years later, too. Pardon my French. Sadly, I didn't ask for a receipt to dispute it later on.