Two Jews were standing and talking on a Moscow street. One of them did not have official papers permitting him to be in Moscow at the time. When a police officer approached them to verify their documents, the Jew with the documents told his friend not to worry as he began to run from the officer.
The officer began to chase him. When he finally caught up, the officer asked him to show his documents, which he did. The officer asked him, "Why did you run away from me when you have the right documents?"
"My doctor told me to run one mile each day," responded the Jew.
"But why didn't you stop when you saw me running after you?" asked the officer.
"I thought your doctor told you the same," said the Jew.