"Win over a sad heart, then only is your life worthwhile."

I was watching a short documentary on the 400+ laughing clubs in India, and this line was uttered by one of the members. It sounds odd, but these folks gather in parks and do laughing exercises to laugh at will. The rationale is this: if laughter induced by other people's actions or words is considered natural, then surely laughter that is self-invoked without external stimulus should be considered natural too? Someone enthused that laughing should be an Olympics game, but then I wonder what could be the basis for judgement then? Loudest laughter? Longest sustaining laughter? Most infectious laughter?