A gang of pirates find themselves shipwrecked on the beach
Luckily there's a harbor near by and the captain heads in to barter for goods.
Naturally the captain seeks out the first merchant who is selling booze and requests his finest bottle of rum.
Upon returning the crew is aghast. "All you came back with is a lousy bottle of rum"? Aye boys the merchant says to me this here's a magic bottle of rum. No matter how much yee drink it never goes dry. "You fool!!! He hoodwinked you. There's no such as a magic bottle of rum"! Ah well, no matter, alls I traded him was a ship that'll never sink.