Anybody else ever see that old b and w film of a psychology experiment with a cage full of rats? The rats in the cage got along fine until one too many are added to the cage. Then the rats have a "melee" or a complete breakdown of social order.The melee probably would have happened sooner if all the rats were drinking (coffee). Reminders me of the famous Palin family melee.

 Animal behavior; ain't it fascinating?