A proposal to classify happiness as a psychiatric disorder.

...No really, a serious one, proposed by a Dr. Bentall, at the Department of Clinical Psychology at Liverpool University in 1992.

Here is the abstract:
It is proposed that happiness be classified as a psychiatric disorder and be included in future editions of the major diagnostic manuals under the new name: major affective disorder, pleasant type. In a review of the relevant literature it is shown that happiness is statistically abnormal, consists of a discrete cluster of symptoms, is associated with a range of cognitive abnormalities, and probably reflects the abnormal functioning of the central nervous system. One possible objection to this proposal remains--that happiness is not negatively valued. However, this objection is dismissed as scientifically irrelevant.
(Link)

I also stumbled on this finding that happiness doesn't predict longevity among the sick, but does so among the healthy.

Happiness does not lengthen the life of seriously ill people, but it does prolong the life of healthy people. Happiness appears to protect against falling ill. One of the mechanisms behind that effect seems to be that chronic unhappiness causes stress, which on its turn reduces immune response.
Another possible mechanism is that happiness adds to the chance of adopting a healthy life style.

I'm guessing this didn't go down so well among the academic community! :)
... Or should I say :|