The World Championship for teams (contesting the Bermuda Bowl) 2003. With two (!) boards to play Italy held a comfortable 21 IMP lead over the USA.
Common opinion was the matter had been decided.
But on the penultimate board the USA won 10 IMP, so when the last (128-th!) board hit the table, Italy's lead had shrunk to 11 IMP.
What happened next, defies imagination.

E/EW		♠	K Q 9 8 7
		♥	7
		♦	J 3
		♣	Q J 9 8 3
♠	A 6 5 4 3			♠	J 10
♥	K Q 10 8 6			♥	5 4 2
♦	4 2			♦	A 7
♣	A			♣	K 10 7 6 4 2
		♠	2
		♥	A J 9 3
		♦	K Q 10 9 8 6 5
		♣	5

¹ at least 5-5 majors

In the closed room something went wrong. EW ended up too high. Notice that Meckstroth never bid. Perhaps that helped to convince the Italians that they were stronger than they originally believed. When Duboin took a second heart bid over Rodwell’s 3♦, Bocchi decided his side had enough to make game a reasonable shot. It didn’t work out that way.

Against east's 4♥ south, Rodwell, led ♦Q to the ace and north, Meckstroth, unblocked ♦J. Declarer led a heart to ♥K and played a low spade. North won with ♠Q and continued with a diamond. South won with ♦8 and played ♥9.  Declarer went up with ♥Q in dummy (west) and tried to cash ♠A, but south ruffed and cashed the ace of trumps. Then he led a diamond and the roof came down on declarer. He could take ♣A and his last trump but his remaining three spades were all losers. Down four – minus 400 to Italy.

The bidding took an entirely different turn in the open room.

¹ at least 5-5 majors

Versace obviously judged the north hand differently than Meckstroth on the other table, since he doubled the 2♦-Michaels Cuebid (probably he showed values in at least one of west's suits). After simply contesting with 3♦ over Hamman’s 2♥, Lauria revalued his hand after Hamman's 3♥ bid. His partner had promised some values by doubling and Hamman's bidding meant Versace had a singleton heart. Lauria therefore jumped to 5♦.

Soloway, west, lead ♣A and switched to ♥Q. The declarer, Lauria, won with the ace and ruffed ♥3 in dummy. He returned to his hand with a club ruff and played ♥J, hoping to pin ♥10 in east.
West covered with ♥K and Lauria ruffed in dummy. From there he played ♠K, west winning with ♠A.

West, Soloway, now could have cashed ♥10, for down two (east still had trump ace to score). The Americans then would have scored +300, plus +400 from the other table, totalling +700 or 12 IMP. Meaning the title to the USA ...on a one IMP difference!
Soloway however did not cash the heart, he played back a spade!

South now could have won with ♠Q, discarding his losing ♥9.
But that too didn't happen. Dummy, Versace, had left the table, so Lauria was playing both his own hand and dummy's. Convinced that west would cash ♥10, Lauria took ♠7 from dummy when west played a card.
When he realised west had not played ♥10 but a spade, he tried to replace ♠7 with ♠Q.
Had he been allowed to do so, the final would have ended in a draw, since the USA would win only 11 IMP (400+100) on the deal. An eight board play-off then would have had to determine the world championship 2003.

Of course the director was called. She ruled ♠7 was a played card since Lauria had touched it with intent to play it. After an Italian appeal the Appeals Committee agreed with the director. And so the gold medal went to the United States on a one IMP difference.

Probably Lauria will have lost a lot of sleep over this deal - and maybe he still does.
And probably Versace still asks himself what he was thinking, when he left the table while the last hand of the Bermuda Bowl was played. Had he kept his place as the dummy, this probably would not have happened.

P.S. Of course the big question is, why did Soloway lead a spade instead of the good heart? Let us listen to what he said afterwards:
'I  saw the ♣7 and it looked like a signal for spades'. He was sure that Hamman knew that they couldn’t cash the second club, so ♣7 could indeed have been a suit preference signal asking for spades.
Soloway continued: 'In the heart suit, our first play is attitude and the second shows present count. Bob played the ♥4 second, and in our methods that showed an even number originally. So it seemed that Bob had started with four hearts and a singleton spade.' In that case Lauria would have no more hearts and the play of a spade, which east then probably would have been able to ruff, was obvious.
'But then there was the auction', Soloway resumed. 'Bob bid only 2♥ the first time. If he had four hearts, very likely he would have jumped to 3♥.'
'At the table I thought I had it right', he concluded. But in retrospect, I feel I should have given stronger consideration to the bidding. Bob didn’t bid 3♥, so he probably didn’t have four hearts. So in retrospect I feel I should have led the heart, not the spade.'
Soloway therefore eventually made the wrong choice, he relied on the play rather than the auction and played his partner for a singleton spade. But because Lauria didn’t realise Soloway had made the wrong choice, the Americans still got their two trick set - and the gold medal in the closest Bermuda Bowl in history.