As this Celebrity Cruises bartender will show you, it's important to put on a memorable show for the ship's passengers. Drink-mixing tricks along the lines of Tom Cruise in the 1988 movie 'Cocktail' create interesting travel memories and always bring people back for more.

The main lesson learned here: If you're going to work at a bar that exclusively serves martinis to privileged vacationers, you'd better offer more than just gin and vermouth.

[via Reddit]