It happened 30 years ago, on November 22, 1987, and lasted one minute and 22 seconds.To this day, no one knows who did it.At 11:15 p.m., the PBS affiliate WWTW in Chicago — Channel 11 for locals — was airing a Doctor Who episode titled “The Horror of Fang Rock.” Suddenly, the video cut out.After a few seconds, a figure appeared — a man, wearing a Max Headroom rubber mask. The figure flashed the finger at the camera, his middle finger covered in a rubber extension. He sang “your love is fading,” lyrics to “(I Know) I’m Losing You” by the Temptations. He hummed tunelessly. He muttered phrases from television shows. He screamed nonsense and then he began to moan.After a moment, he paused to claim he had “made a giant masterpiece for all the greatest world newspaper nerds,” referencing WGN’s acronym and corporate parent the Chicago Tribune.Then, he held up a glove, like the one popularized by Michael Jackson and exclaimed: “my brother is wearing the other one” before pulling it on and saying “But it’s dirty! It’s like you got bloodstains on it!”The camera then cut to a shot of a man’s torso and partially exposed buttocks. The Max Headroom mask had been removed and was being held up to the camera. The rubber extension that had covered the figures finger was stuffed inside the mouth of the mask.“They’re coming to get me!” the man screamed suddenly.“Bend over, bitch,” a female voice responded. The man was then spanked repeatedly with a flyswatter as he screamed.