You may never find a more wretched hive of scum and villainy than Mos Eisley spaceport, but the virtual world of Craigslist runs a very close second. Example: A 27-year old San Jose man tries to buy a PlayStation 3 for $700 in the parking lot of a McDonalds.
The buyer wanted to see what was in the box, but the seller "balked" and asked "What, don't you trust me?" The non-retarded answer would have been "no", but the two swapped anyway. After the cash exchanged hands, the sellers ran off to their SUV and sped through a red light, and the buyer discovered he was holding a PS3 box with some magazines, floor tiles, and a PS2 controller.
Lessons learned: don't hold Craigslist deals at McDonalds, and always see the merchandise first. Especially when someone pulls the "what, you don't trust me?"