Movies
These guys are about as fun as a tax audit.
— Lindsey · The Abyss

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker dismisses some people as dull, comparing their company to a tax audit, an experience famous for tedium and dread. The joke is a dry exaggeration, suggesting that in the speaker's view these individuals bring paperwork-level joylessness rather than any liveliness.
Context reviewed