"We're having a problem sending email out of the department."
"What's the problem?" I asked.
"We can't send mail more than 500 miles," the chairman explained.
I choked on my latte. "Come again?"
"We can't send mail farther than 500 miles from here," he repeated. "A little bit more, actually. Call it 520 miles. But no farther."
The Case of the 500-Mile Email: https://www.ibiblio.org/harris/500milemail.html
claaaaaaassic troubleshooting side effect hyperweirdness
the aptness to play dwarf fortress upgrade thingumabob is arguably an equal to it in some aspects
the plausible explanation is so simple it's painfully obvious, yet precisely why complexity is going to bring unanticipatible issues: https://askubuntu.com/a/946218