If you've been an adult for very long, there's a good chance you've experienced a condition I'll call chronic seriousness.
While this is definitely not an official diagnosis, I would still suggest that it is a serious condition. Typical symptoms I've observed include:
As these symptoms make clear, chronic seriousness is no laughing matter.
Chronic seriousness tends to have an insidious onset. It typically starts with being a responsible grown-up and taking care of all the things that are part of adulthood. But over time it can slowly morph into something more sinister. You may begin to fear that things will fall apart without your constant vigilance and worry.
Soon fun and........