A frum looking man was traveling on El Al, when his seat mate asked what he did for a living.
“I’m a rabbi.”
“Well,” said the man condescendingly, “I was born Jewish. I don’t know much about it, but I presume you could sum it up in one sentence: ‘Do unto others as you would have others do unto you.’”
The rabbi smiled, then said, “And what do you do for a living?”
“I’m an astrophysicist,” he replied smugly.
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