Murphy and his wife, a middle-aged couple,

went for a stroll in the park. They say down on a bench to rest. They

overheard voices coming from a secluded spot. Suddenly Mrs. Murphy

realized that a young man was about to propose.

Not wanting
to eavesdrop at such an intimate moment, she nudged her
husband and
whispered, “Whistle and let that young couple know that
someone can
hear them.”

Murphy said, “Whistle? Why should I whistle? Nobody
whistled to warn
me.”