flow
Explanation
The Joke
A man in what appears to be a therapy or office setting is told: "Henderson, we have some concerns about your flow-charting." When asked if any of his information is incorrect, the response is: "No, it's just that when we zoom in on this area between boxes, we find they've made up of the phrase 'none of this matters' written over and over in tiny letters." Henderson responds, "I don't realize I'd done that," and is told he should perhaps go see the office psychologist. The final exchange reveals: "I would, but to spend all my remaining time with my family," with the other person replying, "Cut out every 'none' and replace it with 'all of this.'"
The joke is that Henderson has been unconsciously embedding an existential crisis into his work product. His flowcharts -- supposedly dry, professional documents -- contain hidden nihilistic messages in the connecting lines between boxes, revealing his deep internal despair about the meaninglessness of his work (and possibly life in general).
The Humor
The comedy works through the absurd contrast between the mundane corporate setting (flowcharts, office psychologists) and the profound existential dread hiding within it. The idea that someone's subconscious despair would leak out specifically through the connecting lines of a flowchart is wonderfully specific and absurd. The suggestion to replace "none" with "all of this" is a darkly funny attempt to fix a psychological crisis through a find-and-replace text edit, treating a mental health emergency with the same tools you would use to fix a typo in a document.