More proof of just how ingrained the Tube Map is in the English psyche is evident in this billboard advertisement for Double Diamond beer – inserted as the punchline in the long-running “Only here for the beer!” campaign. 

The ad campaign itself is almost as much as part of England as the Tube Map; the tag line has entered into the vernacular, much like “Where’s the beef?” in the U.S., and “Not happy, Jan!” in Australia. 

Source: Jay Brooks/Flickr