Accueil Dojokes: A Class Of Third-Graders Was Taking A Field Trip. One day, a class of third-graders from the city were taking a field trip to the country to visit a small farm.The kids were amazed to see all the different kinds of animals on the farm.So the farmer asked one little girl,“What’s the difference between a rooster and a hen?”“The hen lays eggs,” replied the little girl.“Very good!” said the farmer.Then the farmer asked another little girl,“What’s the difference between a duck and a turkey?”“Well,” replied the little girl.“Turkeys can’t swim and turkeys are what we have on Thanksgiving Day.”“Very good!” exclaimed the farmer.Then he asked little Johnny,“Do you know the difference between a bull and a cow?”“Yeah,” replied little Johnny with a grin.“Bulls smile when you milk them.”