The recruiter wrote on Twitter that the commuter did not recognise him at first, and so he asked him a few tube-related questions until the penny dropped.
"He realised, laughed about it awkwardly and got on with the interview," Buckland said, kindly adding: "The tube makes everyone cranky.
"Could happen to anyone but was really unfortunate."
He stressed he didn't hold it against the man, and said as a recruiter he values a person with emotions.
Nevertheless, the man didn't get the job in the end. "He wasn't right for the role," Buckland said.
Buckland's post on Twitter has been retweeted almost 15,000 times.
- The Independent