"The Four Businessmen"

Four businessmen walk onto a train: one from China, one from France, one from Mexico, and one from the United States.
They all sit together in a room with an open window and begin unpacking their lunches.
The Frenchman eats half of his croissant and tosses the remainder of it out the window. The others ask "Why did you do that?" And the Frenchman says "I have enough of those where I come from."
The Chinaman eats half of an eggroll and tosses the remainder of it out the window. The others ask "Why did you do that?" And the Chinaman replies saying "I have enough of those where I come from."
Then, finally, the American grabs the Mexican businessman and hurls him out through the window. The others watched flabbergasted and asked incredulously "Why did you do THAT!?" The American retorts coolly "I have enough of those where I come from."