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xkcd #3211: Amperage
(imgs.xkcd.com)
Title text:
Oh, and do you have any tips on how to vacuum up copper that's melted into your carpet?
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3211/
Eh, ~zero impedance house circuits won't do anything bad to normal electronics - it'll just make sure no fires happen in your walls. I do almost all home wiring in 12 gauge and larger for this reason
Actually, the comic only has 500A breakers and don't say anything about wires. Recipe for fire!
I think that's the joke, especially since the alt text asks about getting melted copper off the carpet.