Man goes to doctor. Says he's depressed. Says life seems harsh and cruel.
Says he feels all alone in a threatening world where what lies ahead is vague and uncertain.
Doctor says "Treatment is simple. A great clown, Pagliacci, is in town tonight. Go and see him. That should pick you up."
Man bursts into tears.
Says "But, doctor..."
"...I am Pagliacci."
Things that sometimes help if you have depression
(The first was on HN, the second here on Tumblr, and the third was on Andrew Hickey's post about depression triggered by the news.)
Original post on Dreamwidth - there are comments there.