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In 1923, England and France divided between them the previously Turkish territories of what are modern Syria, Lebanon and Israel/Palestine. They drew a pencil line on a map to mark the treaty border.
It turned out that the thickness of the pencil line itself was several hundred meters on the ground. In 1964, Israel fought a battle with Syria over that land.
People were killed because someone neglected to sharpen their pencil. That's "scribbles on a piece of paper" for you.
Ref: a book found by Google. I originally learned about this from an Israeli plaque at the Dan River preserve near the border.
A monthly thread for posting rationality-related quotes you've seen recently (or had stored in your quotesfile for ages).