Tyson Edwards' smother on Chris Grant deep in the 4th quarter of the 1997 prelim:
From that game, people usually remember Modra's knee injury, Jarman's performance up forward to fill Modra's shoes, and (most famously of all) Libba's premature goal celebration. But had Edwards not dived on that ball or even been half a second too late, that would go down in history as the moment Grant snatched victory from the jaws of defeat and put the Bulldogs into their first grand final since 1961.
Either St Kilda or the Western Bulldogs would have won the 1997 flag. The 2009, 2010 and/or 2016 grand finals wouln't have had the same meaning. And it's quite possible that, having missed out in 1997, the Crows wouldn't have had the confidence to win the flag in 1998 and the Adelaide Crows might be without a premiership.
A sliding-doors moment.