One day, a student of Mullah Nasrudin went to visit him. He happened to sneak up from behind, intending to surprise Mullah, when he noticed that he was sprinkling bread crumbs around the perimeter of the garden.
"Mullah, what on earth are you doing?"
"Oh, this? It's my technique for keeping the tigers away."
"But Mullah", the student replied, "there are no tigers for miles around here!"
"Effective, isn't it?" said Mullah.