This sign posted at SeaTac has an errant apostrophe which does not appear on similar documents on the TSA 3-1-1 website, nor on those posted at the airport in San Jose.
Apostrophe not allowed in Carry-ons
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From This is London:
With its cute message, Marks and Spencer’s sleepsuit was just the thing for a new baby’s first Christmas.
There was only one problem – that bane of grammar-aware shoppers, an unnecessary apostrophe.
The suits have emblazoned across the chest the phrase “Mum’s dreaming of a quiet Christmas just like the one’s she used to know”.
A little southern-style grammar for y’all this morning:
“Y’all,” being authentically Southern, does things differently. It adds an apostrophe and “s,” as though “y’all” were a noun. So the proper possessive of “y’all” is “Y’all’s.” The first apostrophe signals the omission of the letters “o” and “u” in “you all.” The second signals the possessive case.
(Link)