Ethnic jokes are always dangerous. Gen. James Jones, as Barack Obama's national security adviser, famously regaled a friendly Jewish audience with a variation of a joke about the Hamas militant in Jerusalem who went into the shop of a Jewish merchant and asked to buy food.
"I'm sorry," the merchant said. "I don't have any food, but I've got some nice neckties."
"I don't need a tie," says the Hamas militant, "and I'm hungry."
"Well, my brother has a restaurant down the street, and he has lots of food."
The Hamas man ran down the street, but...