Laid back Australians

Obviously nobody told the stewards and police at the cricket about the laid back Australian stereotype. Here are a few examples of the 'strict' rules put in place at the first test at the Gabba in Brisbane.

1) The official 'Barmy Army' trumpet player was evicted on the first morning for causing a disturbance.
2) Three guys were prevented from entering the ground as they had 'water melon' hats which apparently could have been used as weapons
3) Backpacks were a complete no-no due to terrorist fears
4) Anyone found singing too loudly were asked to sit down and be quiet, if not, eviction was the order of the day
5) And god forbid if you tried to start a mexican wave