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/
That only works in English though and while it does have a pun, I dont see it gaining any cult status...
1337 also only works in English.
The cult status is a good point, though.