客有過主人者，見其竈直突，傍有積薪。客謂主人更為曲突，遠徙其薪；不者，且有火患。主人嘿然不應。

俄而家果失火；鄰里共救之，幸而得息。於是殺牛置酒，謝其鄰人；灼爛者在於上行，餘各以功次坐，而不錄言曲突者。

人謂主人曰：「鄉使聽客人之言，不費牛酒，終亡火患。今論功而請賓，曲突徙薪亡恩澤，燋頭爛額為上客耶？」主人迺寤而請之。

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客有過主人者，見其竈直突，傍有積薪。客謂主人更為曲突，遠徙其薪；不者，且有火患。主人嘿然不應。

俄而家果失火；鄰里共救之，幸而得息。於是殺牛置酒，謝其鄰人；灼爛者在於上行，餘各以功次坐，而不錄言曲突者。

人謂主人曰：「鄉使聽客人之言，不費牛酒，終亡火患。今論功而請賓，曲突徙薪亡恩澤，燋頭爛額為上客耶？」主人迺寤而請之。

魔王勇者 漫畫

A mathematician, a physicist, and an engineer are riding a train through Scotland.

The engineer looks out the window, sees a black sheep, and exclaims, “Hey! They’ve got black sheep in Scotland!”

The physicist looks out the window and corrects the engineer, “Strictly speaking, all we know is that there’s *at least one* black sheep in Scotland.”

The mathematician looks out the window and corrects the physicist, “Strictly speaking, all we know is that is that *at least one side* of one sheep is black in Scotland.”

Ref: http://www.cs.northwestern.edu/~riesbeck/mathphyseng.html

John meets Mary and…

John meets **Mary** and **Paul**.

John **meets Mary** and **greets her**.

**John meets Mary** and **Peter meets Paul**.