Moist had always been careful about disguises. A mustache that could come off at a tug had no place in his life. But since he had the world’s most forgettable face, a face that was still a face in the crowd even when it was by itself, it helped, sometimes, to give people something to tell the Watch about. Spectacles were an obvious choice, but Moist achieved very good results with his own design of nose and ear wigs. Show a man a pair of ears that small songbirds had apparently nested in, watch the polite horror in his eyes, and you could be certain that would be all he would remember.
-- on disguises | Terry Pratchett, Making Money