A middle age couple went for a stroll in a park. They sat down on a bench and heard voices coming from a secluded spot. The wife suddenly realized that a young man was about to propose.

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

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