I think the joke is okay and would have worked if I didn’t have to make sense of a number of confusions I had to work through first.

• number being represented by “nr”. Nothing wrong here, just something that I’m not familiar with.
• the use of “floop” to represent the sound of the list hitting the floor
• the lines in the doorway representing, what I’m guessing are, stairs and not connected to the employee as I first considered
• the disappearance of the desk from one panel to another
• the path one manager in red took to get to the door from sitting at the desk

I don’t know if anyone else has these problems to work through, but having had to work through them muted any enjoyment I would have gotten from the joke had that been absent.