A young man proposes marriage to his sweetheart. The girl replies, "If I marry you, will you promise to give up smoking?" "Yes, I will", came the reply.

"And drinking?"

"I will give up drinking as well."

"And going to the club with your cronies?"

"Yes, I will."

"And what else will you give up for my sake?", she asked finally.

"I have already given up the idea of marrying you."