Tangentially (and anecdotally), not long ago I seem to have contracted what seems like a flu (or the like), and I remember feeling very healthy, social and unusually well—almost high—most of the day right until my brain went foggy and fever started.

In hindsight, I did not behave quite like myself that day, especially considering I felt somewhat overworked the preceding week.

This prompted me to first draw the analogy with taking and withdrawing from a substance, and then to imagine a possibility of some future human-made flu-like virus that preserves the incubation stage effects and lacks the “conventional” symptoms. Like a contagious mood boost, contractable for free by air!