Around 2,000 people marked the end of drinking on the London Underground with an initially good-natured gathering across the network. But police later complained of disorderly behaviour.
Revellers swigged champagne, beer, spirits and cocktails ahead of the ban which came into force at midnight.
Many people celebrating the last night of legitimate drinking met at Liverpool Street Station's west-bound Circle Line platform at about 2030 BST.
The celebrations - like these - were largely good-natured. But other incidents got out of hand with police making 17 arrests. Seven assaults were reported on Underground staff.
The Underground station at Liverpool Street was closed because of overcrowding. Revellers unable to take the train staged an impromptu party on the concourse instead.
The party, dubbed the Last Round on the Underground, was organised via social networking and other internet sites.
Most people simply had a good time. By the end of the evening however, police said the event had been marred by instances of irresponsible and drunken behaviour.
Police said there were "multiple instances of trains being damaged". A spokesman said: "This was an unfortunate end to what should have been a fun event".