A singular shift?

Why is this so incomprehensible?

I came across a funny Reddit thread while scrolling around and it made me nostalgic for the past. One of our Redditor friends wanted to know some of the reasons we had to call in sick or late to work. While I was still in high school, I used to work as a store employee in our neighborhood mall. To make sure I always had some extra money on hand in case I needed it, I would work a few times a week after school. The story goes like this: one chilly winter's day, I had to call in sick to work with…

Why can't he...nevermind