a little story just read from the book

an old man lived alone in northern ireland.his only son was in prison.the old man wanted to plant some potataoes in his garden,but he didn't know anyone who would help him plow up the garden.
he wrote to his son about it,and received this reply,"for heavens sake,don't dig up that garden,that's where i burried the guns!"
at 4 am the next morning,a dozen british soldiers showed up and dug up the entire garden,but didn't find any guns.
confused,the old man wrote to his son telling him what happened and asking him what to do next.
his son's reply was"just plan your potatoes".