I'd probably say that for me, the altercation between Steve Waugh and Curtley Ambrose in Trinidad, as the West Indians first started to realise they might actually go down. There was just something that invoked Mr T and Rocky Balboa - with the immortal sendoff from Waugh: "Why don't you go and get ******" To be fair, I didn't see it live, but I was following the series and saw the news report of the incident the next day. Just really evocative, and had me fist pumping (no, not in that way).
Steve Waugh's final century against England, where the whole nation sat down and watched overtime, was a real highlight too.
After that, probably the AFL '89 Grand Final, when Mal Blight decided a good strategy to take the Hawks down was to ensure that as many of them left the ground on stretchers. Had everything, even Dermie puking up blood and playing on with a busted rib. Only just got home. That night after the game, we took our horns and belted out a fair racket outside a mate's house before we entered - only we were a bit out of it and it was the wrong house, and we had to run for our lives as these six huge guys (one who already had a black eye - and they may well have been Cats supporters) chased us down with the sole purpose of beating the living crap out of us. Fantastic game though, full of drama and in the end, victory.