Tube
Explanation
The Joke
A job interviewer asks a candidate, "Where do you see yourself in five years?" The candidate responds with a bleak, existential description: "In a sort of complex tube that encounters various nutrients, which it uses to repair the tube so that it can continue encountering nutrients, until it falls apart, ending the tube." When asked "And why do you want to work here?" the candidate continues in the same vein: "Better nutrients to sustain the tube longer... and also, I find woman-tube and want to bring food to the little tube."
The interviewer's response in the final panel is: "Wow, I really appreciate your honesty." The candidate adds: "Also, nitrogen and death."
The Humor
The comic strips away all the polished, aspirational language of job interviews and replaces it with a brutally reductive biological description of human existence. When you remove all social niceties, a human being is essentially a tube (the digestive tract) that processes nutrients to keep itself going, seeks a mate, and reproduces. The humor comes from applying this unflinchingly accurate but deeply deflating biological framework to the performative optimism of a job interview. The candidate is being completely honest -- more honest than any interviewer would ever want -- and the interviewer's polite appreciation of this "honesty" makes the scene even more absurd. The throwaway addition of "also, nitrogen and death" is a perfect capper, reducing the last shreds of human dignity to basic chemistry and mortality.