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Haunted House
(xkcd.com)
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Can someone explain this for folks whose existence is outside the US
It's not important to the joke.
Knowing what the different States are and different cities (for the title text) is pretty important. As someone who is from outside the United States, I wouldn't've been surprised if "Pennsylvania Wiring" was really a standard of wiring.
It would've been the exact same gag if these were Italian or Japanese or whatever.