A Useful Way

　Father: Jack, why do you drink so much water? 
　Jack: I have just had an apple, Dad.
　Father: What's that got to do with it?
　Jack: I forgot to wash the apple.

　中文：

　爸爸：杰克，你干嘛喝这么多水呀？
　杰克：我刚才吃了个苹果，爸爸。
　爸爸：可是这跟喝水有什么关系呢？
　杰克：我忘了洗苹果呀。