scammed in bangkok

Oh, the first thing I did on arriving in Bangkok was I fell for a taxi scam. There was a huge, huge line for the official taxi stand at the airport, it was hot and sticky and the middle of the night, and I was half dead from 24 hours of travelling. This guy comes up to me and asks do I want a taxi-meter (the normal, distance-metered cabs) with no waiting? Uh, sure. But I forgot to ask how much the fare was, duh. Guess what, I paid 3x the normal fare to the city. The only good news was, even at 3x the price it was still about 30% cheaper than a comparable fare in the states. But still, how dumb can you get?