Twenty years after accidentally being interviewed live on the BBC instead of the tech expert producers intended to book, Guy Goma is still remembered less as the victim of a TV blunder and more as the patron saint of pretending you know what's going on at work. Twenty years later, the recollections are fonder. In the run-up to the May 8 anniversary, people are reposting clips of the moment. A book about it is out. And Mr. Goma is being celebrated as a folk hero of sorts for anyone who has ever found themselves ill-equipped for a challenge in the workplace. "It captures this sort of anxiety that we all have about being thrust into a role we're not prepared for, but trying to perform competently anyway," said Rafal Zaborowski, a senior lecturer on digital culture at King's College London. Mr. Goma's story began when he applied to the BBC for a job as a data specialist and was called in for an interview.…