A woman from the city was visiting her sister-in-law, and was taking a train through the country. Suddenly she noticed some cows. "What an adorable bunch of cows" she remarked the person next to her. "Not a bunch, herd", the person next to her replied. "Heard of what?" "Heard of cows." "Of course I have heard of cows!" "No, a cow heard." "What do I care that a cow heard. I have no secrets to keep from a cow!"