biological-clock
Explanation
The Joke
A woman dramatically announces to her partner: "Bob! My biological clock is ticking!" He interprets this as her changing her mind about wanting children and excitedly asks if she wants to have a baby. She clarifies: "No. I made a clock entirely out of living flesh." She reveals an enormous, grotesque mass of living tissue shaped vaguely like a clock, shouting "BEHOLD!" In the final panel, she says she would still like to have children someday, but she just does not think they have the time — implying she has spent all her time building a clock out of flesh instead.
The Humor
The comic is a bait-and-switch built on the double meaning of "biological clock." The common idiom refers to a woman's awareness of her declining fertility with age — the social pressure to have children before it is "too late." The comic takes the phrase literally: she has constructed an actual clock made of biological material. The boyfriend's hopeful reaction ("You want to have a baby?") sets up the audience's expectation for a relationship conversation, making the reveal of the horrifying flesh-clock all the more jarring and funny. The final punchline adds another layer: she does want children, but she has no time left because she was too busy building the biological clock — creating an ironic loop where the "biological clock" prevented rather than motivated reproduction.