The cardboard Policemen

Many of you must have heard of the story of tying an elephant with a
thin piece of rope to a flimsy piece of stick on the ground. And yes,
the elephant would not try to walk away, believing that it would be a
vain attempt. It tried furiously when young, tied with strong chain that
would not give way. Now conditioned, the elephant still remembers the
experience and would not waste any effort