A German tourist walks into a McDonald's in New York City and orders a 
beer. (In Germany and many parts of Europe, McDonald's actually does serve 
beer.)  The local guy in the line behind him immediately gives him the 
jab: "They don't serve BEER here, you MORON!"  The German fellow felt 
pretty stupid, but suddenly turns to the New Yorker with a surprised look, 
and begins to chuckle.

"And what's so funny?!?" the New Yorker demands.

"Oh, nothing really, I just realized that you came here for the food."