之前看到一个极其冷的笑话
有人在街上碰到一对很可爱的姐妹，于是上前问：“你们谁是姐姐啊？”其中一个回答：“我是我是！”然后他又继续问：“那你们谁是妹妹啊？”当时妹妹看他的眼神跟看傻b一样

I saw a very dry humour before.
Someone met a pair of very cute sisters on the street, so he went up to them and asked, "Who is the older sister?" One of them answered, "I am, I am!" Then he continued to ask, "Then who is the younger sister?" At that time, the younger sister looked at him like he was an idiot.