Nicholas Shakespeare in The Telegraph:
In 1954, shortly after his 80th birthday, William Somerset Maugham was shown the in-house abattoir of a Swiss clinic in Vevey and then injected with the minced foetus of a freshly slaughtered sheep by means of a large horse-syringe into his buttocks. Other patients who had sought to recapture their youth in this manner were: Charlie Chaplin, Noël Coward, Thomas Mann and Pope Pius XII.
Later, apparently revitalised by his treatment, the most widely read English writer since Dickens was observed by an elderly lady on Vevey railway station trying to play hide-and-seek with Alan Searle, the last of his secretary-companions. “Yoo-hoo,” Maugham called from behind a pillar. When the red-faced Searle reprimanded him, the woman was quick to scold: “You should be gentle with that nice old man. He thinks he’s Somerset Maugham.”
More here.