A 14-by-48-foot billboard in SoMa advertises ChatTJB, "the leading chat interface powered by AI." The AI is Tucker Bryant, a 32-year-old former Google employee typing every reply himself — and roughly 11,000 people took him up on it.

On the corner of Sixth and Folsom, in a stretch of SoMa where the billboards mostly promise superintelligence, there is now one that promises less. It measures 14 by 48 feet and reads, in the flat confident font of a company that has raised money: "ChatTJB: The leading chat interface powered by AI."

The catch is in the letters. On ChatTJB, "AI" stands for Average Individual, and the average individual is Tucker Bryant — a 32-year-old former Google employee turned conceptual artist, who put up the board for $6,000 a month and then sat down to answer every prompt that came in, by hand, himself. There is no model behind the curtain. There is a guy with a keyboard.

A lot of people found the curtain. Over eight days, ChatTJB.org took in roughly 15,000 prompts from about 11,000 different people, Bryant told The San Francisco Standard, which first reported the stunt. On weekends the traffic spiked to something like 5,000 prompts in a single hour — more than one man can type through, and Bryant eventually paused the service to catch up. (The responses came through the website, not a phone line, though the board also lists a number.) His Instagram post about the billboard drew close to 50,000 likes. ChatTJB Pro, at $5 a month, had two subscribers.

The joke only lands because of where it's standing. This particular corridor of South of Market has become the physical home of AI advertising — slabs of gradient and vague promise bolted to buildings, startup names you've never heard of rendered at the scale of a public utility. Bryant's board is built from the exact same materials: same dimensions, same font, same breathless copy. It just tells the truth about what's underneath, which in his telling is a person doing a mediocre job on purpose.

"This is about cognitive surrender. I'm criticizing the hype and blindness around AI," Bryant told the Standard. He described his own answers as "very, very mid. Objectively mid," and the whole enterprise as "a high-effort shitpost" that is also, genuinely, a working chat interface staffed by a real person. Futurism, which also covered it, confirmed the part that matters: he really is typing each reply.

What a person walking Sixth Street tomorrow will see is a billboard that looks like every other billboard on the block — until they read it, pull out a phone, and send a question into what they think is a machine. On the other end, for now, is one man in San Francisco, trying to keep up.