Possible Duplicate: Where does the use of “why” as an interjection come from? This is a common English phrase that I'm sure everyone has heard before. However, I find it puzzling.

The grass is wet because it rained last night. This seems the simplest and most elegant expression of the meaning. I am always suspicious of "reason (s)" and "why" being next to each other. There can โ€ฆ

Thus we say: You never know, which is why. but You never know. That is why. And goes on to explain: There is a subtle but important difference between the use of that and which in a sentence, โ€ฆ

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