you-made-me
Explanation
The Joke
A man is looking in a bathroom mirror, but his reflection has grown long wild hair and has become a separate, sentient being. The reflection (or the hair itself) delivers a dramatic monologue: "You waited too long, Gerald. You let me grow for weeks and weeks, and one day there was a vital spark, a life force. Yes, Gerald, I live, and I must kill you. So no man can know of my lowly birth!"
The caption at the bottom reads: "I am beginning to regret putting off shaving for so long."
The Humor
The comic takes the mundane experience of procrastinating on grooming and escalates it to a horror/sci-fi scenario where neglected facial hair achieves sentience and turns murderous. The reflection speaking dramatically about a "vital spark" and "life force" parodies Frankenstein-style creation narratives, but the "creature" is just an overgrown beard.
The understated caption is the real punchline -- Gerald's dry, matter-of-fact response to a sentient beard threatening to murder him is simply mild regret about his grooming schedule. The contrast between the melodramatic threat and the casual understatement creates the comedy. It also taps into the universal experience of looking in the mirror after letting grooming slide too long and barely recognizing yourself.
References
The reflection's monologue parodies Mary Shelley's "Frankenstein" (1818), where the creature turns against its creator and is ashamed of the circumstances of its creation. The line "so no man can know of my lowly birth" directly echoes the creature's resentment of being brought into existence.