Inherent Happiness

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The Shaltanacs are a race from the planet Broop Kidron Thirteen, who had their own version of the Earth phrase, "The other man's grass is always greener." Although, given their planet's horticultural peculiarities, theirs was, "The other Shaltanac's joopleberry shrub is always a more mauve-y shade of pinky russet," and so, the expression fell into disuse, and the Shaltanacs found they had little choice but to become exceptionally happy and content, which surprised everyone else in the galaxy, who had never realised that the best way not to be unhappy is not to have a word for it.
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~ The Hitchhiker's Guide to the Galaxy