I had the term "apropos of nothing" stuck in my head and I didn't know what it meant.
Apparently it wasn't relevant.
Apropos for this week
In the year 1806, a well-dressed man in his twenties visited a doctor who was renowned throughout London for being able to treat what nowadays we'd call depression, but back then was called melancholia.
The patient explained that he felt overcome by a terrible sadness, that he didn't want to get up in the morning. He could not see any point in his existence.