Every first of the month the Mullah would cross the border with thirty donkeys with two bails of straw on each. Each time the custom person would ask the Mullah’s profession and the Mullah would reply, “I am an honest smuggler.”
So each time The Mullah, his donkeys and the bails of straw would be searched from top to toe. Each time the custom folk would not find anything. Next week the Mullah would return without his donkeys or bails of straw. Years went by and the Mullah prospered in his smuggling profession to the extent that he retired.
Many years later the custom person too had retired. As it happened one day the two former adversaries met in a country far from home. The two hugged each other like old buddies and started talking. After a while the custom person asked the question which had been bugging him over the years, “Mullah, please let me know what were you smuggling all those years ago?”
The Mullah thought for a few seconds and finally revealed his open secret, “Donkeys.”