The Arab immediately steals three pastries and puts them in his pocket.
He says to the Jew, "See how good I am? The owner didn't see a thing." The Jew says to the Arab, "That's typical of you Arabs. I am going to show you an honest way to get the same result."
He goes to the owner of the bakery and says, "Give me a pastry and I will show you a magic trick."
Intrigued, the owner accepts and gives him a pastry. The Jew swallows it and asks for another one. The owner gives him another one. Then the Jew swallows that one and asks for a third pastry and eats that, too.
The owner is starting to wonder where the magic trick is and asks, "So what did you do with the pastries?"
The Jew replies, "Look in the Arab's back pocket....."