I had a guy try to take me for a ride on my Ex's wedding ring (I found him on eBay where he had good feedback, but I bought from him outside of eBay). I google-mapped his address, pulled up street view, and called him. I told him flat out that a plane ticket was only a tenth of what he'd ripped me off for (I told him the flight number and airline, too), and that I'd be in New York by 3pm Eastern Time Zone that day to drag him into the alley next to his store if he didn't authorize the refund in the next hour.
Refund time: 36 minutes.