The Silastic Armourfiends were an insanely aggressive race who lived on the planet Striterax approximately twenty billion years ago "when the universe was young". They were extremely keen on fighting - one of the best ways to deal with a Silastic Armourfiend was to lock him in a room by himself, since he would beat himself up sooner or later. They wrecked the surface of their planet in constant wars, and the whole population lived within bunkers deep below the surface.

In an attempt to deal with the problems their violent nature created, the Silastic Armourfiends passed a law that anybody who had to carry a weapon as part of their normal work (including policemen, security guards and primary school teachers) must spend a minimum of 45 minutes each day punching a sack of potatoes.
It was hoped that this would allow them to work off their surplus aggression. This plan worked only until the Silastic Armourfiends began just shooting the potatoes instead.