The pub is believed to have been named after the flasks of Hampstead
mineral water that could be purchased here when Hampstead was popular for its wells in the 18th century, and
The Flask,
Flask Walk, Hampstead, is another pub nearby. Like all good pubs, The Flask has its own legends which may or may not be true. It is said that the
highwayman Dick Turpin hid from the law in the stables there, that the artist
William Hogarth drank at the bar and even that
Karl Marx was a customer. For good measure, the pub is also said by some to have a female ghost. It was also reported in 1736 a 64 year-old man, accompanied by a hairdresser, ran from the Bull's Head in
St Giles to The Flask in just 45 minutes, "To the Surprize of every Body who was present". The pub is sometimes included as part of the
Karl Marx pub crawl due to its association with the philosopher. The pub was used in a Christmas 1995 television commercial for Carlsberg Lager, the 60-second film "Last Orders" opens at The Flask and shows two men drinking and laughing as the minutes fly by to closing time. As they emerge from the pub, they literally stop in their tracks as they realise there has been a major snowfall. The commercial’s soundtrack also stops for a second as the camera surveys the whitened scene. The subtitle asks ‘The best closing time in the world?’ before both of the men agree that it is as they hare off into the snow like excited children. ==Interior==