It is largely unknown to players and followers of the modern game that rugby started off purely as a contest for forwards in opposition in line-outs, scrums, rucks and mauls. This pitted eight men of statuesque physique, supreme fitness and superior intelligence in packs against one another. In those days, the winner was the pack that won the most set pieces. The debasement of the game began when backs were introduced. This occurred because a major problem was where to locate the next scrum or line-out. Selecting positions on the ground for these had become a constant source of friction and even violence.
The problem was resolved by employing forward rejects, men of small stature and limited intelligence, to run aimlessly around within the field of play. Following a set piece, the ball would be thrown to one of them, who would establish the next location either by dropping it or by throwing it to another reject for dropping. Very occasionally, a third reject would receive the ball before it would be dropped, and crowds would wildly cheer on these rare occasions. Initially these additional players were entirely unorganised, but with the passing of time they adopted set positions.
For instance, take the scrum-half. He was usually one of the smallest and least intelligent of the backs whose role was simply to accept the ball from a forward and to pass it on to one of the other rejects who would drop it, providing the new location for the forwards to compete. He could easily (given his general size) have been called a quarter forward or a ball monkey but then tolerance and compassion are the keys to forward play and the present euphemism was decided on. The fly-half plays next to the scrum-half and his role is essentially the same except that when pressured, he usually panics and kicks the ball. Normally, he is somewhat taller and slightly better built than the scrum-half.
Interestingly, in the antipodean colonies, who had taken an interest in rugby since they had no skills in any other game, (other than swimming, which they are often very good at since their ancestors used to jump ship and try and swim home instead of being transported, but that's another story for another time) the scrum-half is known as the half-back, the name allegedly being chosen because he was approximately half the size of a normal player. The fly-half is there known as the first five-eighth, allegedly since they were not quite small enough to be a proper half, but three-eighths short of the size required to have qualified to become a forward.
Tet with back2 lft
Outside of these two were players who became known as centres. The centres were opportunists who had no expertise but wanted to share in the glamour associated with forward packs. After repeated supplication to the forwards for a role in the game they would be told to get out in the middle of the field and wait for instructions. Thus, when asked where they played, they would reply "in the centre". And they remain to this day, parasites and scroungers who mostly work as lawyers or used car dealers.
Outside of the centres came players known as wingers. You may ask, why wingers? The answer is simple. Because these were players who had very little ability and were the lowest in the backline pecking order, they were placed as far away from the ball as possible. Consequently, and because the inside backs were so diligent in their assigned role of dropping the ball whenever they received it, the main contribution to the game made by the winger was not to get involved. Their instructions were to run away as quickly as possible whenever trouble appeared, and to avoid tackles at all costs. The fact that the game was organised so that the wingers didn't get to touch the ball led to an incessant flow of complaints from them and eventually the apt description "whingers" was applied. Even though the "h" dropped off over the years, the whingeing itself unfortunately has not.
Lastly, the full-back. This was the position given to the worst handler, the person least able to accept or pass the ball, someone who was always in the way. The name arose because the forwards would understandably become infuriated by the poor play invariably demonstrated by that person, and call out "send that fool back". He would then be relegated well out of everyone's way to the rear of the field. So there you have it. Let's return to the glory days of a contest between two packs of eight men of statuesque physique, supreme fitness and superior intelligence. The rest can go off to where they will be happier – playing soccer.
(Modified from an original piece from The All Blacks Supporters Club, whose origination is acknowledged.)