It was 1944, when an American GI made his numbers and got to go home. He made it back to England straight from the front. He had to take a train to get to his flight home. The train was full only one empty seat but a woman has her little dog set up in it and when the American first came upon the seat she just frowned. But too tired to argue he decided to check for another seat one more time. There were no seats and landed up back at the seat occupied by the dog. He explain that he had come back from the front and had been fighting for three years and almost begged her and the woman turned her nose up and looked away. Well the GI grabs the dog and tossed it out the window. And sits down. The woman is in shock. She looks to the older fellow sitting across from her and says aren't you going to do something? The old man clears his throat and says, You Americans are backwards people, you hold your fork in the wrong hand, you drive on the wrong side of the street and now you've gone and thrown the wrong bitch out the window.
Disclaimer No actual animals were hurt in telling this joke. Their intelligence may have been offended but none were really thrown out a window in this case.