Blind Date

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After being with her all evening, the man couldn't take another minute with his blind date. Earlier, he had secretly arranged to have a friend call him to the phone so he would have an excuse to leave.When he returned to the table, he lowered his eyes, put on a grim expression and said, "I have some bad news. My grandfather just died.""Thank heavens," his date replied. "If yours hadn't, mine would have had to!"

和盲约对象呆了一晚上后，男人再也受不了了。他事先安排了个朋友给他打电话，这样他就能借故先离开了。当他回到桌边，他垂下眼睛，装出一副阴沉的表情，说：“有个不幸的消息，我的祖父刚刚去世了。”“谢天谢地！”他的约会对象说，“如果你的祖父不死，我的祖父就得死了！”


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<p>哈哈...今天正是七夕.</p>

why must the use someone's death for an excuse?

有解说很好，不过实在是不好笑，无厘头。