See also: various points in the Evil Overlord list[0]. Selected examples:

    #12: One of my advisors will be an average five-year-old child. Any flaws in my plan that he is able to spot will be corrected before implementation.
    #60: My five-year-old child advisor will also be asked to decipher any code I am thinking of using. If he breaks the code in under 30 seconds, it will not be used. Note: this also applies to passwords.
    #74: When I create a multimedia presentation of my plan designed so that my five-year-old advisor can easily understand the details, I will not label the disk "Project Overlord" and leave it lying on top of my desk.

[0] https://tvtropes.org/pmwiki/pmwiki.php/Main/EvilOverlordList