I have noticed that we are often inclined to endow our friends with the stability of type that literary characters acquire in the reader’s mind … Whatever evolution this or that popular character has gone through between the book covers, his fate is fixed in our minds, and, similarly, we expect our friends to follow this or that logical and conventional pattern we have fixed for them … Any deviation in the fates we have ordained would strike us as not only anomalous but unethical.

Lolita, Vladimir Nabakov