Anyone Ever Had a Car Sold Out From Under You?

I had a carb sold from "under" me at a Fling, the thing was in my hands getting inspected and some schmuck walks up, hands the guy a $50 and literally takes the carb out of my hands! Talk about huevos! I look a the seller, WTF? He shrugs his shoulders and shows me the 50. I walked away a wiser man, although I was still up $50...