The punctuation mark that annoys people the most is, without a doubt, the apostrophe. Whole books have been written lamenting atrocities like “five carrot’s and three kiwi’s” (for the record, that ...
A few years ago while copy editing an article, I was shocked to see something like this: “I lecture my sales staff about what I call ‘me syndrome,’” Jones said. What shocked me was the punctuation.