Title text:
In 1899, people were walking around shouting ‘23’ at each other and laughing, and confused reporters were writing articles trying to figure out what it meant.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3184/
Skrilla is from Philadelphia, where the police apparently don’t use 10-67, but it’s “Report of Death” in some areas so this still seems the most likely explanation.
Sorry, you’re right. Philadelphia