As a note aside, I don't believe the web page you posted is a WTF.<div><br></div><div>Imagine you have a File class and a method isFolder(). What would you answer if the file/dir does not exist or you don't have permissions to access it?</div>
<div><br></div><div>true ? No, I am sure you wouldn't</div><div>false ? Well, is not actually false... You just can't determine it.</div><div><br></div><div>In other terms: you have no children, but someone asks you: "how is your son's name?". Now, surprise me with your favourite dichotomy.</div>
<div><br></div><div><br></div><div>Regards,</div><div>Rafael Fernández López.</div>