How so? One circle is things you do on a normal day. The other circle is things you do when the world is ending. And their overlap includes going to work. So you go to work on a normal day and on days the world is ending. And for some freaking reason that's true; even if the world is ending, you go to work
You're wrong about both paragraphs. It's not the days that fall into the circles. It's the activities you do on those days. So it's not a normal day that's world ending. It's things you do on both kinds of days.