Books
"Now, that I didn't know," said Reg. "Your past has murkier things in it than I dreamed possible. A quality, I might add, that it shares with this soup."
— Douglas Adams • Dirk Gently's Holistic Detective Agency

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
A dry, absurdist comparison between a mysterious past and a bowl of murky soup. The joke lands through deadpan understatement, treating something ominous as merely unappetizing. It's a playful jab built entirely on that single mismatched comparison.
Context reviewed