You should've known it

"I never would have married you if I knew how stupid you were!" shouted the woman to her husband!
The husband replied, "You should've known how stupid I was the minute I asked you to marry me!"
　

你早该知道

“如果早知道你有这么蠢我决不会嫁给你！”一个女人对她的丈夫喊道。
“早在我向你求婚的时候你就应该知道了。”丈夫回答道。