A German man walks into a McDonald's in the United States.
After waiting in line, he finally gets to the counter, and he orders a pint of beer, because you can get beer at McDonald's in Germany.
An American customer overhears the man's order, and he approaches the German man and says, "How could you be so stupid? You cannot order beer here." while laughing at the German man right to his face.
The German man thinks for a second and then he starts laughing uncontrollably. Not just any laugh. This is a laugh so intense that he is struggling not to fall over.
The American customer is no longer laughing. He now has a puzzled look on his face. He asks the German man, "What's so funny?"
The German man says, "I just realized that you came here for the food."