'Pastime' derived from an Indian sport that used to be on Channel 4. The actual game involved two teams of Indians in nappies on a dusty court, with the apparent aim being to hit each other in the legs. Why, with a little fine tuning, this would make a great playground game, we said.
We 'fine tuned' it to the point where we actually just beat each other up whilst yelling "KABBADI!".
Although the casual racism was the cherry on the cake, it was those two key elements - shouting and fighting - that made it such a hit.