The main challenge you face if/when you want to laugh in any public environment is your own mental conditioning of what you think you can and cannot do. It's a big list of should and should nots, and it is self-imposed. The ideas shared in this article will help.
In this article you will learn about true smile vs. fake smile. It is believed that the Duchenne smile is the only form of what one could call the "genuine" smile. The "Pan American smile," on the other hand is the smile expressed to show politeness.