The Grand Final ended a short while ago, and Reservoir has sprung back to life. Mere seconds afterwards, in the distance, a recording of "Pub With No Beer" began to play at full volume, followed by a belligerent yawp of "Carna Pies!!!"
For my overseas readers, or anyone similarly confused: no, the Pies didn't actually play.
Footnote: I've just had it explained to me that the final siren is when the season starts for a Collingwood supporter. Everything makes a lot more sense now. Everything except the Slim Dusty part. I'm going to assume the pub is a metaphor in this instance.