Cocktail Time by P. G. Wodehouse
If Lord Ickenham had not succumbed to the temptation to dislodge the hat of irascible QC, Beefy Bastable, with a well-aimed Brazil nut, the latter's famous legal mind might never have been stimulated to literature. But the incident provoked Beefy to write his expose of the younger generation, a novel so shocking that it caused endless repercussions for its hapless author and sparked off a series of outrageous misunderstandings. And it seems that only the inventive talents of Lord Ickenham himself might resolve matters.