Spud gun legality and requires licensing. Pneumatic spud guns are classed as air guns in New Zealand, which means the owner must be either over 18, or over 16 with a A-Category Arms License. Combustion cannons are deemed a firearm, requiring the owner to hold an A-Category License. These laws are rarely, if ever applied and spud gun ownership and building has proved a popular hobby with many New Zealanders. All combustion spud guns are considered firearms. Pneumatic spud guns with projectile energy greater than 4 joules (3 ft·lbf) are classified as section 1 firearms and do require a license. In recent years,
Back slang words spoken phonemically backwards. English frequently makes use of diphthongs, which is an issue for back slang since diphthongs cannot be reversed. The resulting fix slightly alters the traditional back slang. An example is "trousers" and its diphthong "ou", which is replaced with "wo" in the back slang version "reswort". Back slang is said to be used in prisons by inmates to make it harder for prison wardens to listen into prisoners' conversations and find out what they were talking about. This use of back slang was highlighted in the 9 June 2010 episode of "Crimewatch Roadshow". Back slang has