... is one of the most popular games on I'm Sorry, I Haven't a Clue – if not the most popular of all.
Its premise is that panellists take turns to come up with the names of apparently random London Underground stations, and the first one to say "Mornington Crescent" is the winner. (Occasionally you will hear mention of other locations that aren't Underground stations – and some of them aren't even in London.)
It's generally implied (although never stated) that the panellists are taking an imaginary journey around the Underground. They will often refer to arcane rules, variants and tactics, such as the Brighton Handicap or Hugo's Second Stratagem. But in reality, everyone (not least the audience) knows that there are in fact no rules and the object of the game is simply to get laughs.
© Haydn Thompson 2021