After university, I got a job sub-editing and for years I was a literary editor.

To those who care about punctuation, a sentence such as "Thank God its Friday" (without the apostrophe) rouses feelings not only of despair but of violence. The confusion of the possessive "its" (no apostrophe) with the contractive "it's" (with apostrophe) is an unequivocal signal of illiteracy and sets off a Pavlovian "kill" response in the average stickler.

Thurber was asked by a correspondent: "Why did you have a comma in the sentence, 'After dinner, the men went into the living-room'?" And his answer was probably one of the loveliest things ever said about punctuation. "This particular comma," Thurber explained, "was Ross's way of giving the men time to push back their chairs and stand up.

The reason to stand up for punctuation is that without it there is no reliable way of communicating meaning.

I hate to be treated as if I'm invisible. I get incensed when people talk across me or refuse to catch my eye in a restaurant or shop.

We read privately, mentally listening to the author's voice and translating the writer's thoughts. The book remains static and fixed; the reader journeys through it.

The advent of the mobile phone was a disaster. We are forced to listen, open-mouthed, to other people's intimate conversations. Increasingly, we are all in our virtual bubbles when we are out in public, whether we are texting, listening to iPods, reading or just staring dangerously at other people.