The immigration officer looks skeptical. “I know some things about Jews and kosher eating. Why would you need four sets of gold teeth?”
The Jewish immigrant responds, “I am very Orthodox. Extremely pious. I use one set for milk products and one for meat and a third for Passover.”
“I see,” says the immigration officer, now looking less skeptical. “You are obviously a very religious man. But you only mentioned three religious occasions. What is the fourth?”
“Oh,” the Jewish immigrant muses, “that’s just for when I want a ham sandwich.”