Another story actually, one of my mates in Perth was kicked out of an ODI against NZ - was there with a group and had a kiwi mate next to him. They were basically giving a bit of banter to each other, my mate may have mentioned something about sheep sh@ggers ... Some bloke a few rows back complained, and out he went... Doesn't take much in Perth though, seen guys being kicked out for starting a wave or making a beer snake which really is pretty harmless.
At the recent MCG 20/20, guy got thrown out for drinking beer out of his shoe (he did do it 4-5 times though). At least with the wave or beer snake there's the tiniest chance that someone else could get the tiniest bit hurt, not sure what the danger to others is with drinking out of a show though. Apart from it being pretty rank.