LONDON – MAY 31: An empty carriage littered with empty alcohol containers and rubbish is seen at Kings Cross Tube Station on the during a Facebook cocktail party on the Circle Line on May 31, 2008 in central London, England. Tonight is the last evening when Londoners can consume alcohol on public transport. The cocktail party, organised on the networking Web site Facebook, attracted thousands of revellers to enjoy one last drink on the London Underground before the ban’s enforcement on June 1, 2008. The ban, introduced by the new London Mayor Boris Johnson, is an attempt to clean up unruly behaviour on the London public transport system. (Photo by Ann Tornkvist/Getty Images)