When life gives you lemons, you either make lemonade or suck those tangy, sour little bastards raw. And it looks like Splendour In The Grass went down the first route by making a funny about the spectacularly soggy conditions at the festival.
Before you ask, no! The gag had nothing to do with being a little piggy rolling around in mud or Shrek warning people to stay away from his swamp.
Shrek at Splendour like ‘get out of my swamp’ hehe