Simulacrummy

Imagine you're a scientist working on an experimental process to clone human beings. You have finally succeeded in cloning yourself, and using growth-acceleration technologies (patent pending), you are now the proud creator of an exact replica of your body, right down to the fingerprints. But although your clone is physically indistinguishable from you, it has a flaw in its personality that you do not find in your own.

What is your clone's shortcoming or fault?

 
Source: Kokology - The Game of Self-Discovery