How different and unique can an individual think before creating some idiotic thing that actually a great masterpiece of work. Take a look to this smallest gun, called Swiss Mini Gun.

Features:
Total length is about 5.5 cm
Shoots 2.34 mm calibre rim fire ammunition
Use special bullet which is the smallest rim fire ammunition, developed only for it
Is a double action revolver

It is a fully authorized and licensed gunsmith company in Switzerland.