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For us, this means reading endless stories that refer to Civil War shells or bombs as "cannonballs" and vice versa. Here, have another: "Civil War-era cannonball safely detonated." Note that "It turns out the cannonball was filled with gunpowder." Full of tricks, those cannonballs.
In a different kind of balls, Private Eye collects this kind of nonsense in a weekly column called "Colemanballs," named after an incompetent sports broadcaster. We need columns like that in this country, if shaming can still do any good.