來電無須言語，交給音樂，一定有效。
這一點，澳洲導演Peter weir明白，好萊塢巨星Harrison Ford 更能身體力行。
電影《證人（Witness)》中，Harrison Ford 飾演的費城警探Book緝兇來到民風保守的Amish村落，因為八歲小男孩Samuel是兇案目擊證人，他與Kelly McGillis飾演的母親Rachel相依為命，Book 一方面要保護證人，一方面還要追查兇手，一方面還要面對古樸的Amish 文化，日久就與Rachel有了曖昧情愫，但是礙於Amish傳統，彼此的好感只能藏在心裡。
但是邱比特才不管什麼Amish傳統，就在Book挑燈修車的夜晚，電路接通，車上廣播有了聲音，傳出的的歌聲就是「(What a) Wonderful World」這首歌，而且是關鍵詞：「But I do know that I love you
And I know that if you love me, too（我知道我愛你，而且我也知道你也愛我）」，一切都夠白話了吧？於是，Book敲著車頂，興高采烈邀請Rachel 就在一燈如豆的幽暗車庫裡，聞樂起舞。
Don’t know much about history不太懂歷史
Don’t know much biology
不太懂生物
Don’t know much about a science book
不太懂科學書
Don’t know much about the French I took
不太懂我選修的法文
But I do know that I love you 我只知道我愛你
And I know that if you love me, too
而且我也知道你也愛我
What a wonderful world, this would be這是多美好的世界啊
接下來繼續扯地理、三角、代數，目的只在繼續強調我們彼此都相愛，也承諾要乖乖做個好學生，好贏得你的愛……. La-ta-ta-ta-ta-ta-ta…….露骨的情詩，唱給被愛情迷昏了頭的戀人，誰曰不宜？
Don’t know much about geography
Don’t know much trigonometry
Don’t know much about algebra
Don’t know what a slide rule is for
But I do know, one and one is two
And if this one could be with you
What a wonderful world, this would be
Now, I don’t claim to be an A student
But I’m trying to be
For maybe by being an A student, baby
I can win your love for me
.⋯⋯⋯⋯
Yeah, but I do know that I love you
And I know that if you love me, too
What a wonderful world, this would be
來電無須言語，交給音樂，世界一定美好。
(What a) Wonderful World
(1959)
作詞/作曲：Herb Alpert / Sam Cooke / Lou Adler
演唱：Greg Chapman