I remember a bloke dropping out from under the posts in a game - against us - the ball fell - stuck in the mud - and didn't bounce. His boot went over the top of it ... We all just stood laughing. It was such a shitty day - wind and rain - but so muddy.
One of the funniest things I saw was at a game between the Western Suburbs Magpies and the Illawarra Steelers at Wollongong Stadium. I was on one end of the ground behind the posts with my father and we saw a seagull fly quickly directly into one of the uprights and it dropped to the field dead. The Magpies had a drop-out at that end of the field shortly after. Steve Georgallis (who was playing for the Magpies) saw the dead seagull and was like (wtf???) and kicked it off the field.
Another funny thing I saw was between the same 2 teams, but at Campbelltown Stadium. It was VERY windy and one of the teams kicked-off, but the wind was so hard it blew the ball right back towards the kicker. The ref penalised the team kicking off. I am not sure if that was the right decision because the ball travelled 10 metres past halfway in the air, but it was too high for the other team to get it before the ball blew back to the other side of the 40 metre line.