Normal for Norfolk
Normal for Norfolk (or NFN) is a slang term used in some parts of England for something that is peculiar, or weird. It is also the title of a series of comic shows by the comedians The Nimmo Twins who satirise the idiosyncrasies of the Norwich and Norfolk population.
The term comes from an urban myth that Social Services in Norfolk used to record the letters 'NFN' against the personal details of certain clients, where they were considered to be a bit strange or had peculiar habits. According to the urban myth, such clients were so common in that area that they were considered normal as far as Norfolk was concerned. Another version of the urban myth tells of hospital doctors rather than social workers.
The term is considered derogatory because it portrays people from Norfolk as normally being strange, or peculiar. The portrayal of people from Norfolk in this light is a common stereotype in England.
Within Norfolk itself, the phrase is generally known as "Normal for Wisbech", which is in neighbouring Cambridgeshire.