Its actually really easy to diagnose depression on ANY random person....
but it is harder to classify a person as being "happy" most of the time.
Now ...if the happy person is in short supply, does that not make the depressed person the norm, and the happy person as the one that is abnormal?
I like happy people: but the are hard to come by: and sometimes, being depressed, just makes you more depressed seeing a happy person:
I like seeing happy kids!! ! - b/c by the time you have passed adolescents...most of us are depressed anyway.
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Chickens have feathers, Like eggs have shells...being tickled can hurt.