Happiness is not something you either have or you don't. It is a choice that you make, a lifestyle if you must. Happiness cannot be bought (except maybe in Thailand but that's an entirely different kind of happiness and a whole other kettle of fish), and it cannot be taken away from you, it is a decision that you make when you first open your eyes in the morning and it will determine the outcome of your entire day as well as the people around you. So, please when you are casually strolling through your Friday in the direction of a fantastic weekend, choose to be happy.*
*If you are one of the grunpy douches that runs past people and don't reply when they give you a cheery hello, please read this post twice, and maybe take notes.