From John Banville's TNR review of The Letters of Samuel Beckett, 1929-40:
Quite so! Readers are therefore invited to suggest advertising copy that could have been written by Mr Beckett...“
In London, Beckett considered a number of possible day jobs, toying with the notion of becoming an airline pilot or--wait for it--an advertising copy writer. (There is food for a dinner-party game, devising the jingles that Beckett might have thought up for washing powder or diapers.)