Joke

Murphy and his wife, a middle-aged couple, went for a stroll in the park. They sit down on a bench to rest for awhile. Soon they overhear voices coming from a secluded spot nearby. Suddenly Mrs. Murphy realizes that a young man is about to propose.

Not wanting to be eavesdropping during such an intimate moment, she gently nudges her husband and whispers, "Whistle to let that young couple know that someone can hear them."

To which Murphy replies, "Whistle? Why should I whistle? Nobody whistled to warn me?"