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Explanation
The Joke
A man returns home announcing "Heee, I'm back, Dad!" His father greets him with: "All those years you were gone, did you learn anything? Well, look at the house!" The implication is that the house has deteriorated during the son's absence. The father continues: "Due to your constant procrastination and general laziness, I have in fact made very little progress in my life."
The son responds: "So I guess what I want to say is, I'm going to have to reevaluate that protective instinct." The final panel shows the father with a sinister expression saying "I've waited so long for this moment," while appearing to menace or confront his son, who looks alarmed.
The comic subverts the classic "prodigal son returns home" trope. Instead of a heartfelt reunion, the father uses the son's return as an opportunity to blame him for the father's own lack of accomplishment, and the son's "reevaluation" of his protective instinct toward his father suggests the dynamic is about to become adversarial.
The Humor
The humor comes from the inversion of the expected emotional reunion. The father, rather than being overjoyed, has apparently been stewing for years and has somehow convinced himself that his son's absence (or earlier laziness) is responsible for the father's own failures. The son's clinical, detached language about "reevaluating protective instincts" contrasts hilariously with what should be a tender moment. The final panel's ominous tone turns what began as a homecoming into something resembling a horror setup, playing on the dark side of family dysfunction.