The Legend of Zelda: The Wind Waker -
"You shouldn't press 'A' to advance your meter until late in the auction. After the second warning, build it up, and near the 5-second warning, max it out so that you can place a bid. Whatever the bid price is at, if Link bids an amount that is over 10% of the current bid, all of the other participants in the auction will be stunned for almost 15 seconds. If Link bids 20% more than the top auction price, they will be stunned even longer. Towards the end of the auction, make such a bid and it will assure that Link wins.