Teacher: Kevin, why are you late this time? 来自幽默学英语网http://www.linkstom.cn/humor/
Kevin: Please sir, I bruised two fingers knocking in a nail at home.
Teacher: I don't see any bandages.
Kevin: Oh, they weren't my fingers! I told my little sister to hold the nail.

我妹妹的手指头
老师：凯温，这次你怎么又迟到了？
凯温：对不起，老师，我在家钉钉子，砸坏了两个手指头。
老师：怎么没有扎绷带呀？
凯温：噢，砸的不是我的手指头，我叫小妹妹扶着钉子的。