An elderly couple went for a stroll in the park and after a while they sat down on a bench to rest.
Just then they overheard voices coming from a secluded spot nearby.
Suddenly the woman realized that a young man was about to propose to his girlfriend.
Not wanting to eavesdrop at such an intimate moment, she nudged her husband and whispered, “Whistle to let that young couple know that someone can hear them.”
Her husband said, “Whistle? Why the hell should I whistle? Nobody whistled to warn me.”