Bentleg,
Re. the brick (or can of coke etc) generally an offense, but I an certain some bush lawyer here will think up some outlandish scenario to the contrary.
Re. landing anywhere, brush up on ALAs. Not to mention sundry other local, state and federal legislation/regulation/ordinance that might have an impact, particularly anything to do with national parks, waterways, defence, or anything controlled by a local ALC.
Remember the good old days of flour bombing and streamer cutting competitions??
Seriously, this is a great example of the stifling Australian approach to aviation regulation.
The FAA/NZ CAA regulation is just two very short paragraphs.
The PAP/CASA Review draft Part 91 (1999) regulation was a single paragraph. At that time, the CASA Regulations/Orders, by comparison was 14/15 pages total. I don't know what the present page count is, probably not much different.
Tootle pip!!