George Selwyn once declared in company that a lady could not write a letter without adding a postscript. A lady present replied, ‘The next letter that you receive from me, Mr. Selwyn, will prove that you are wrong.’ Accordingly he received one from her the next day, in which, after her signature was the following:–

‘P.S. Who is right, now, you or I?’

— Charles Carroll Bombaugh, Gleanings for the Curious from the Harvest-Fields of Literature, 1890