People say that you always have to tell the truth. But they do not mean this because you are not allowed to tell old people that they are old and you are not allowed to tell people if they smell funny or if a grown-up has made a fart. And you are not allowed to say, 'I don't like you,' unless that person has been horrible to you.

The Curious Incident of the Dog in the Night-time: Vintage Children's Classics (ed. Random House, 2012) - ISBN: 9781448139859