I more or less gave up on apostrophes a long time ago. There seems to be a cosmic jar filled with this punctuation mark, which writers shake over their texts, letting apostrophes fall willy-nilly into words. Thus I ignored this sign, which shoves an apostrophe into a plural, where it does not belong:

Tuesday’s. Sigh.
Some grammarians call this usage a “greengrocer’s apostrophe.” (Notice the correct use of the possessive apostrophe in the term, which names a punctuation error.) Why “greengrocer’s”? My opinion, based on no research whatsoever, is that people who use this term believe a shopkeeper (greengrocer) is more likely than a non-business owner to insert apostrophes into plurals. That belief doesn’t match my experience. If I stacked all the student essays, term papers, and other writing I graded and corrected during my teaching career, the top of the pile would be within spitting distance of the moon and maybe even topple over onto a moon rock or two. Nearly all of those writing efforts included a “greengrocer’s apostrophe,” and none of the students were grocers, though many were (environmentally) green.
Though I scarcely glance at extra apostrophes, I did stop short when I saw this sign:

Granny’s combative.
The color difference between the first and last pair of lines initially led me to believe that the tavernkeeper was making a statement about grandmothers and their alleged capacity to slug someone. But I’m a grandmother, and though sorely tempted at times, I have never punched anyone. Then I noticed that no punctuation appeared anywhere at all. Perhaps the sign is a statement about grannies’ tendency to wallop cocktails, I mused. (Sidepoint: There are hot cocktails? Who knew! ) The image of grandmothers bopping martinis, mimosas, and other drinks made me wonder whether a new temperance movement was brewing. I still don’t know what the sign means. Just to be safe, I have one piece of advice: Don’t mess with a grandma, especially when she’s drinking.