A Panda walks into a cafe. He orders a sandwich, eats it, then draws a gun and fires two shots into the air. "Why?" asks the confused waiter, as the panda makes toward the exit. The panda produces a badly punctuated wildlife annual and tosses it over his shoulder. "I'm a Panda," he says, at the door. "Look it up." The waiter turns to the relevant entry, and, sure enough, finds an explanation. Panda. Large black and white bear-like mammal, native to China. Eats, shoots and leaves.

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.

Do you lend books and DVDs to people? If so, don't you always regret it? All my life I have forced books on to people who have subsequently forgotten all about it. Meanwhile, on my shelves sit many orphaned books loaned to me over the years by trusting, innocent souls - some as long ago as the Seventies.

Manners are about imagination, ultimately. They are about imagining being the other person.

Offence is so easily given. And where the 'minority' issue is involved, the rules seem to shift about: most of the time a person who is female/black/disabled/gay wants this not to be their defining characteristic; you are supposed to be blind to it. But then, on other occasions, you are supposed to observe special sensitivity, or show special respect.

Truly good manners are invisible: they ease the way for others, without drawing attention to themselves. It is no accident that the word "punctilious" ("attentive to formality or etiquette") comes from the same original root as punctuation.

The reason it's worth standing up for punctuation is not that it's an arbitrary system of notation known only to an over-sensitive elite who have attacks of the vapours when they see it misapplied. The reason to stand up for punctuation is that without it there is no reliable way of communicating meaning.