To respond to one's own negative feedback on eBay with a strong retort that simultaneously vindicates the seller and humiliates the buyer.
Buyer: Itm was misreprasentid, nevr recieved bad communcation BEWAR
Seller: Buyer is a moron and bought the wrong part, but I gave him a full refund anyway. This is the thanks I get?
Third party: How'd you like that feedbackhand?