I was at the 2006 England v Pakistan Test Cricket Match at the Oval on Day 4 and saw the first game decided by forfeit in the history of the sport.
England were batting in the afternoon session and, after inspecting the ball, the umpires decided that Pakistan had been tampering with it illegally and awarded England 5 penalty runs. This was signalled by the umpires but not announced to the crowd. Many of us didn’t pick up what was happening immediately.
At the end of the tea interval, the Pakistan team refused to return to the pitch for an hour in protest against the ball tampering charge - but in the meantime, the umpires had asked them to return to the field and then decided that the game was over, with England winning by forfeit on the grounds that there was no team to play against. All of these were not clearly announced in the ground either - I had to phone my Dad, who was watching on the TV at home, to find out what was going on. Some 2 hours after the game had “ended” we were finally told on the PA system that we should go home as there would be no more cricket that day (at this point, there was still some argument about whether the decision would be reversed and the game would continue)
Subsequently, the game, after being awarded to England, was for a short period, declared a draw before reverting to an England win in the record books, after it was pointed out that the forfeit decision had been made in accordance with the laws of cricket, so there were no grounds for it to be called a draw. The head umpire was banned for the remainder of his contract and thrown out of international cricket thereafter.
So I saw the first and only time a Test match has been won by forfeit, a game that has had its result changed in the record books and then back again and an incident that ended the career of an international umpire.