One for a Richmond fan I sat in front of years ago (late 80's or thereabouts).
We were getting smashed, as was usual in that year. Suddenly, a dog ran onto the ground and stopped the play. No idea how a dog got into the MCG, let alone onto it.
A bloke behind me was up in a flash and screaming at the top of his voice towards the Richmond bench, "Leave the dog on and take Laffy off!"
Don't know if it would make a good ad but was bloody hilarious.