算術

小兒子在家做算術作業, 一邊做一邊說:
He said to himself, "Two plus five, the son of a bitch is seven. Three plus six, the son of a bitch is nine."

他媽媽聽了說: 你這是在幹嗎呀?

小兒子說: 做算術作業! 老師就是這麽教我們的!
他媽媽很生氣,第二天去興師問罪。

老師聽了大笑, 說:
 "Actually, what I taught them was, two plus two, THE SUM OF WHICH, is four."