Nikon Aquisition Syndrome, defined as an addiction to buying Nikon products, irrespective of their use, value or need. A very expensive addiction which can lead to marital disharmony and also storage problems. NAS can only be controlled by buying the latest Nikon gear, be it a camera (D800), lens or accessory such as a Speedlight. The addiction is severe when the victim goes and buys products such as the Nikon 1 range of cameras and lens although said member is a DSLR user and committed to their D700 and all the other D's in their camera storage area.
You may consider that the acronim NASA refers to the space agency but is it really a cover for the Nikon Aquisition Syndrome Anonamous. This has been proven when last year this "agency" purchased several Nikon D3S cameras under the guise that these were for use in space programmes. They were actually for severe victims of NAS!!! I am a NAS sufferer and this is why I have ordered a D800. Thankfully I have some control of the illness as I am not ordering a D800E or a D4 (well not yet anyway!!)