Vanity of earthly concerns

"A surprisingly large number of auto-tattooists choose for the exercise of their dermatographical art the chief motto of British service industries, namely FUCK OFF. Why anyone would want these words indelibly imprinted in his skin is a mystery whose meaning I have not yet penetrated, though my researches continue, but I recall a patient who had the two words tattooed in mirror writing upon his forehead, no doubt that he might read them in the bathroom mirror every morning and be reminded of the vanity of earthy concerns."