What alcoholic beverage makes free to play online games more entertaining?

I enjoy playing free to play games like Combat Arms and Huxley when I am am work. However, sometimes they get a get repeatitve. My friend suggested that I mix Coke and Rum (that way the boss won't know either) and put it in a fast-food cup (i.e. MacDonalds, etc.)

Which drinks do you enjoy while at work and playing video games?