Joke or not, Location Earth Dogtags seem to be something you can actually buy. The text of the website sounds sincere except for the money-back guarantee, which seems intentionally worded for maximum irony. I have no idea.
I like that aliens will recognize that humans divide one another up by the difficult-to-see vector of who wears a skirt vs. who wears pants. Also that they will innately recognize a Robinson projection of earth continents.
If the aliens follow the line on tag and return you to the spot where it ends up in North America, it looks like you would end up in Bentonville, Arkansas, the new capitol of Planet Earth.
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Pulsars and solar systems works, though.
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