Rabbi Levy is walking home from shul one shabbes when he sees Issy in front of him. Issy is a learned and respected man who can hold his own with the rabbi on Talmudic discussions. As Rabbi Levy tries to catch up with Issy, he is shocked too see him go into the Chinese Crab restaurant. Rabbi Levy sees Issy giving his order to a waiter and a short time after he sees the food arrive — plate of shrimps, lobsters and crabs. As Issy picks up the chopsticks and starts to eat, Rabbi Levy bursts into the restaurant and confronts Issy.
“Issy, just what do you think you are doing coming into this restaurant and ordering this treif? You are not only violating everything we taught about the dietary laws, but you also seem to be enjoying this food.”
“Rabbi,” says Issy, “did you see me enter this establishment?”
“Yes.”
“And did you see me order this food?”
“Yes.”
“And did you see the waiter bring the food to me?”
“Yes.”
“And did you then see me eat the food?”
“Yes.”
“Then I don’t see a problem, Rabbi. Everything was done under full rabbinical supervision.”
From Oy Vey: More! The Ultimate Book Of Jewish Jokes Part 2, by David Minkoff