Christopher Petrie, stopped in a makeshift vehicle, powered by a 50cc engine, in Noosa on Queensland's Sunshine Coast, north of Brisbane.
Petrie's DUI attorneys prevailed at an adjournment from magistrate John Parker as they sought to establish "whether a motorized esky [cooler box] was in fact a motor vehicle."
An amused Parker inquired with Petrie about his cooler box's performance.
"How much beer can it hold?" he asked the defendant. Criminal Defense DUI lawyer Petrie argued the cooler box could hold "at least a couple of cartons."