It's said to be the best medicine and increasingly laughter is being harnessed as a form of therapy and stress release. Canvas' clown story took a look at red-nosed professional clowns charged with easing the atmosphere of children's wards in New Zealand hospitals. Evidently laughter offers more than
Shelley Bridgeman: Medicinal laughter in all its forms

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Laughter is best at its purest, unforced form explains Shelley Bridgeman. Photo / Thinkstock

I found it hilarious. One page took me about half-an-hour to finish. I'd read a sentence, laugh, cry, put the book down, slap my thighs, gulp for air and laugh some more. Finally I'd compose myself, wipe the tears away, pick up the book and read another sentence - at which point the entire process would begin again. I discovered stomach muscles I never knew existed.
In the interests of research and in case I needed a true belly laugh in the future I held onto this book and read the chapter in question about a year later. And honestly, I couldn't understand why I'd found it so funny the first time. It was kind of amusing but it wasn't hilarious. Perhaps novelty and freshness are crucial components of spontaneous laughter.
I suspect that a sense of guilt may also fuel a good laugh. For me at least, feeling that I really shouldn't find something funny, either because it involves someone else's misfortune or a non-PC take on a subject, can sometimes make it seem even funnier. Perversely, the flames of laughter can also be fuelled by the realisation that the source of the humour isn't actually that funny when you really think about it. Laughing in inappropriate forums or at inopportune times is also likely to render the chortles unstoppable - as Hilary Barry recently discovered during a news bulletin on Radio Live.
So these may be the ingredients for an authentic laugh: freshness, spontaneity, an unexpected source and a confronting subject mixed up with a guilty conscience and a dash of irreverence. As contagious as the common cold, laughter can be organic and naturally occurring or artificially derived. I know which version I prefer.