"Christopher Sykes, in his biography, reports visiting
[Evelyn Waugh] in the hospital, where he found him grumbling in great pain in the aftermath of an operation for piles [hemorrhoids]. Attempting to solace his friend, Sykes remarked that he assumed the operation, painful though it might seem now, was in any case necessary. 'No,' Waugh replied, 'the operation was not necessary, but might conceivably have become so later on.' 'Not necessary!' said Sykes. 'Then why did you have it done?' 'Perfectionism.'"