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Philadelphia rule
(lemmy.world)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
This appears to be some Philly folklore with no real source other than a silly Onion article from the 90s. It’s possible the Onion was spoofing a real thing that happened, or somebody just made it all up. It’s very funny either way.
https://www.theonion.com/sinn-fein-leaders-demand-year-round-shamrock-shake-avai-1819564253
And not at all out of character for the city of brotherly love.