The chapter covers special bilinguals; that is, those who have both a regular and a unique relationship with their languages. Among them, one finds bilingual writers of literature who express their art in their first language, their second or third language, or even in both their languages. There are also those who make a living from their extensive knowledge and careful use of their languages such as interpreters, translators, second-language teachers, and so on. Others, such as airline pilots and traffic controllers, or foreign correspondents, do not have to reflect on the linguistic aspect of their languages as much but depend on them, as well as on specific skills, to do their jobs. And others still owe a lot to their language proficiency and bicultural abilities to assure their safety, such as sleeper agents. All share many similarities with regular bilinguals, but they are also characterized by a number of interesting differences. The author concentrates on the latter.