Ann promises to pay her cousin Bert, who is dangerously obese, $10,000 if Bert loses 100 pounds within the next two years. Bert agrees, performs his part of the bargain, and asks for the money. Ann refuses to pay, saying that she forgot about the deal, but that even if she did make such a pledge, there was no valid consideration for it. Bert files a suit against Ann. In whose favor is the court likely to rule, and why?