What is the best/worst you've done when selling at a swap meet?

I had a bed load of parts at a show, backed in, unloaded, pulled forward, unloaded the rest. Could not see out the rear cap window stuff piled up so high. When we left, it barely come to the top of the wheelhouse...kept looking under the truck, thought I had backed over some parts.
Best $ show was buying a box load of Dinky/Corgi toys from a resale shop and selling them for half of what was listed in the current price guide. Bought for seventy-five cents each and sold on an average of 25 dollars each.
Worst one was a local train show. Sold enough to pay for the spot and then came home with a display cabinet the vendor next to me gave away. Could've said no...