Dressed in a red t-shirt and sauntering casually with a friend, the drinker stood out in Sky News footage of men and women running down Borough High Street, away from the London Bridge scene of the attack that left seven people dead and 48 injured.
The image spread like wildfire across Twitter and British newspapers said the man, whose identity is unknown, was a symbol of defiance.
"True symbol of the British spirit as man flees terrorist attack clutching his pint," said student Henry Slesser (@HenrySlesser), on Twitter.
Others joked that it was only right that he should take his beer with him, given London's notoriously high prices.
"Evacuate? Well, OK. But this beer cost six pounds ($7.74) a pint. I'm taking it with me," said another Twitter user, Andrew Brooks (@taxbod).
Londoners take pride in, and sometimes joke about, showing fortitude during adversity.
Tourist shops are awash with memorabilia emblazoned with "Keep calm and carry on", a slogan drawn from a World War Two poster that became popular in the last 10 years.
Saturday's attack, in which three men drove a van into pedestrians on London Bridge before stabbing people in nearby bars and restaurants, occurred five days before a parliamentary election.
British Prime Minister Theresa May said the vote would go ahead as planned on Thursday.
Residents of the northern English city Manchester also looked to their city's culture for solace after a suicide bombing at a pop concert killed 22 people and injured 116 nearly two weeks ago, Britain's deadliest attack in almost 12 years.
(This story has not been edited by NDTV staff and is auto-generated from a syndicated feed.)