A: If you fall in love like him, you will go soft in the head, as well.
B: Come off it.
A: You want a bet?
B: Why not!
soft in the head
That bitch must be making you soft in the head.
Tim must be soft in the head to have believed that story.
Have you gone soft in the head?
I think George is getting soft in the head.
1. come off
讲解：《柯林斯词典》解释道：You say 'come off it' to someone to show them that you think what they are saying is untrue or wrong.译为中文是： 别撒谎了！别瞎说！
e.g. Come off it, tell the truth!
e.g. Oh, come off it! You can't expect me to believe that nonsense!
e.g. Come off it! England don't have a chance of winning the match.
e.g. Now come off it, Harry. It is the same old tale.
2. fall in love：坠入爱河，爱上
e.g. It was a long time before I had the courage to fall in love again.
e.g. It is natural that he should fall in love with such a beautiful girl.
e.g. Mary and Tede fall in love at first sight and married soon.
e.g. Are you easy to fall in love with someone?