Read more Here with the Mail Online You don’t have to go to the greengrocer’s to spot them. Errant apostrophes are springing up everywhere. And while their misuse is among our most common grammatical mistakes, it is also the most annoying. Nearly half of those given a short punctuation test were unable to use the apostrophe properly. A classic example below and it would appear that the apostrophe showing in the photo below should be elsewhere in the banner!