but let us not underestimate the other simple treats that your adventure has up its sleeve the fish may well be in sparse supply as you sit there contemplating ; the heavens could just open , drenching both you and your cheese and pickle sandwich in the process ; the field you have to cross in order to gain access to your chosen spot may well contain a disagreeable bull , who stirs from his slumbers and takes issue with the fishing-flies attached to your hat or , perhaps worse still , a warm , steaming present , unceremoniously off-loaded by a passing heifer , goes unnoticed by your good self as you whistle along your merry way before stepping in it , and in so doing postponing your saunter for several minutes while you scrape the delightful stuff off your wellington boot with clumps of grass and a dried stick .