恋水无痕
你在(跟我)开玩笑 = you are kidding me! 或 you've got to be kidding me!其他的:you've got to be joking!you must be fooling around.pulling sb's leg = 骗sb.
qiaochu168
You are joking!You are kidding!Impossible.You are just kiddingYou are joking You are playing tricks.