In the strange but true department: many years ago I bid in a "live" auction hosted on eBay by a very large and reputable firm. I "won" the bid, got the confirmation email from both the seller and eBay and then, because it was Sunday, waited until Monday to call the company in L.A. to submit payment with a credit card. When I called that Monday, they informed me there had been a "system error" and that the item had been sold to another bidder. I couldn't believe it. Well, guess what? That item is back on eBay, being sold by the other bidder, evidently.