An Englishman, a Jew and an Arab were in the train.

A fly lands on the Englsihman's shoulder.

"Get off you filthy insect!" said he as he brushed the fly away.

The fly land on the Arabs shoulder.

He catches it and eats it.

A few minutes later, another fly lands on the Jew's shoulder.

He catches it, and says to the Arab "You want to buy a fly?"