17. Petradox
Not really sure how the Petradox could possibly be plugged in; but the real mystery is how someone managed to get three metal prongs into a rock in the first place!
And the Petradox isn’t an electrical plug covered over by a rock, for if that were the case, the metal would have corroded over the last 100,000 years (which is roughly the age of the rock).
So in essence, the Petradox is a large rock with metal prongs sticking out of it, which resembles any modern-day electrical adapter.
How or why this rock was used still (and perhaps forever will) remain a mystery.
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