One day, an immigrant from Poland entered a New York City Police Precinct to report that his American wife was planning to kill him.

The police officer on duty was intrigued by this, and he asked, "How sure are you that she is gonna kill you? Did she threaten to kill you?"

"No," replied the nervous immigrant.

"Did you hear her tell someone else that she's gonna kill you?"
"No."

"Did someone tell you that your wife is gonna kill you?"
"No."

"Then why did you think she's gonna kill you?" asked the exasperated police officer.