Never refer to people by their name. Refer to them by a name known from history, literature, or even the movies. "Hey there, Socrates!" OR "Johnny Appleseed over there has some issues."
It especially works if you are pointing out a characteristic about someone that is similar to a characteristic of the name you call them, but it isn't necessary.
--AND--
Learn some dance moves from a musical (Westside Story is one of the best for this) and sometimes randomly bust out with a short and quick dance step. If you sing while doing it you will double how happy it makes you.
Remember these items on the happy list are not for other people to enjoy. They are designed to entertain yourself and make YOU happy. Others might laugh at you, but who really cares about that... right?