双胞胎十分相似，他们会玩很有趣的身份转换游戏。享有相同的DNA，因此体貌特征也相当匹配，同卵双生儿可以此轻松愚弄朋友和亲属。但是当要欺骗更加精细的识别工具，例如指纹测试，长得如此相像的两个人就没那么好运了。
那是因为基因不能完全说明表面像灯芯绒一样的指尖。事实上，我们指尖那凸起，凹陷和漩涡的形成是因为在子宫中不固定的压力造成的。甚至是脐带长度轻微的差别都可能改变你的掌印。并且迄今为止，破案者还没有碰到过任何有着相同指纹的人。
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