Here in Gothenburg people 'ride the Beer Boat'.
Stena's Denmark ferry goes between Frederikshamn in Denmark and Gothenburg in Sweden. Loads of people use it to buy alcohol on the boat at reduced prices, then ride the same boat straight back to Gothenburg without stepping foot outside the Danish terminal.
And we're talking some serious stocking up here! You see them strapping on huge boxes of beer and spirits to hand trucks with bits of bungee cord. Then they're wheeling their enormous loads down the gangway at Gothenburg terminal, lumbering like mastodons and trying not to pulverise small children.
And then it's time to PARTY! :-)