On Wednesday night I heard a story about someone cracking an old passwd file from Bell Labs. All passwords cracked quickly except Kernighan's, which took three days. His password was a chess move.
On Friday morning I had my esprit de l'escalier: I would have guessed that was Thompson's password.
"I appreciate SDF but it's a general-purpose server and the name doesn't make it obvious that it's about art." - Eugen Rochko