The Romans built Hadrian's Wall to keep the Picts out of Roman Britain.
Eventually, the Picts died off, and were replaced by the Celts.
When the Celts encountered the Wall, they asked the Romans what it was for.
Told the reason, the Celts relied, "But they're all dead; we live here now."
To which the Romans responded:
"Picts, or it didn't happen."
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