A good example of an abnormal behavior assessed by a multi-criteria approach is depression: it is commonly seen as a deviation from ideal mental stability, it often stops the individual from 'functioning' a normal life.
I believe, however, that such abnormal moments can be found in everyone, and it is all the more fortunate when they occur in individuals with creative talent or with clairvoyant powers. Giorgio de Chirico
I like to take these unusual characters and then make them as normal as possible, because we all know that the tragedy and the abnormal always hides itself behind the normal. Isabelle Huppert
I truly cannot imagine men with men, women with women, doing what they were not physically created to do, without abnormal stress and misbehavior. Jerry Falwell
It may be an extreme example brought about by abnormal circumstances - but the criteria of human rights kick in, surely, precisely when the conditions are extreme and the situation is abnormal. Breyten Breytenbach
Libertarians argue that no normal adult has the right to impose choices on other normal adults, except in abnormal circumstances, such as when one person finds another unconscious and administers medical assistance or calls an ambulance. Tom G. Palmer
Variability is the law of life, and as no two faces are the same, so no two bodies are alike, and no two individuals react alike and behave alike under the abnormal conditions which we know as disease. William Osler