What Cocktail is a stylish app with a simple concept: what kind of cocktail do you want to drink, right now? By inputting your mood and location, then shaking (not stirring, of course) the app, you get a drink suggestion with a well designed logo and the recipe to go with it in case you're making your own. Sure, there's not a lot to it, but the design of the app is a great example of form meeting function. If you're at a bar and in a state where you can't choose your own drink, What Cocktail seems like a perfect solution.
As of this writing, the app is on sale for US$0.99, so you can go grab it for just a buck. If there's a downside, it's that the drink choices are somewhat limited. Not only will you probably know the drink that comes up, but it might not quite fit the mood you're in. That's to be expected, though; you definitely want something simple to make and order, and if you're ordering drinks selected by an app, you have to know that they won't always be the right thing no matter what. I have one thing to say to that: Cheers! Drink up anyway.*
*Of course, always drink responsibly and safely. And stay away from tequila -- that stuff is trouble.