In case of an emergency...giggle

Many people in this world, when faced with awkward, sad or disturbing circumstances, resort to a chuckle, a giggle, a tort or even just a strange smile. Although this repsonse may often be involuntary, I imagine that it may not always be received with a similar response. I myself am one of those people and have often found myself in situations when an uncontrollable giggle or smirk can get me in trouble, even in the tragic case of receiving and giving bad news. This, clearly, is not an appropriate response and the need to gain control over ones facial expressions becomes rather urgent. But then again, life is too short and always will be! So smirk away!
The 'giggle reponse' is quite prominent in Korea and from what I recall, in many other Asian countries too. And it is not an inappropriate (altough can be irritating if a hangover is involved) nor impolite repsonse. it is an endearing mixture of fear, happiness and downright confusion. Recently I realised that I have been living in Seoul for a year now and I still find myself subected to the 'giggle response'.
Ordering coffee seems to be the most prominent place where the 'giggle' takes place. Requesting a coffee in any format can often result in, not only one giggle, but a chorus of giggles from part-time teenage baristas. I'm sure there are many 'giggle' places where all different people observe the outburst and as far as i can see, its here to stay! Whether you are speaking korean or english, I'm afraid there's no avoiding it and if you have managed it please let me know the trick. But for the meantime, this endearing response is welcomed because when you imagine the alternative, it ain't so bad to be part of a giggle in a giggleless world :)