Householder-occupiers who permit an adult child to host a barbecue party for young adult guests do not owe a duty of care to guests in respect of grossly dangerous and criminally irresponsible conduct by another adult guest, where the risk of such conduct was not reasonably foreseeable and the occupiers had no effective means of control. A domestic quantity of methylated spirits stored in a garage is not a 'dangerous substance' attracting a non-delegable duty under Burnie Port Authority. There is no established social host liability doctrine in Australian negligence law. The question whether social hosts have a duty to prevent drink-driving by intoxicated adult guests remains open.
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