Violence in the London Stadium once again marred proceedings as Chelsea were dumped out of the EFL Cup by West Ham.
There has been a history of violence in and around the Hammers' new home all season with home fans fighting amongst themselves.
And the EFL clash turned nasty in the dying seconds as Chelsea and West Ham fans launched missiles at each other.
One Blues fan was struck on the head with a coin after Cheikhou Kouyate's opener and many home fans were more interested in taunting their visitors than watching the game.
And, as Chelsea supporters looked to leave the taunting continued and the exchanges grew progressively more unpleastant.
Antonio Conte made seven changes to the side that claimed a thumping 4-0 win over Manchester United with only N'Golo Kante, Gary Cahill, David Luiz and Cesar Azpilicueta surviving while John Terry made his long awaited return to action.
The Italian also gave young Blues Nathaniel Chalobah and Ola Aina a chance to shine from the start.
It was backs to the wall early on as the home side looked to exploit Chelsea's re-modelled defence.
And they had the lead after 11 minutes as Kouyate got the better of John Terry in the air to head past Asmir Begovic.
The Bosnian goalkeeper was the busier of the two stoppers and made some crucial saves from Dimitri Payet and Michail Antonio to prevent the Blues falling further behind at half time.
Shortly after the restart though, the Hammers doubled their lead as Edimilson Fernandes found time and space in the area to drill the ball past Begovic to make it 2-0.
Conte threw on Eden Hazard, Pedro and Diego Costa in a bid to chase the game but the home defence stood firm and progressed into the quarter finals of the competition.
There were ugly scenes in the dying minutes as seats and other objects were traded between the two fans before Gary Cahill scored a consolation with the penultimate kick of the game.
But the violent scenes were the major talking point with security at the London Stadium once again on the agenda.
The governing body are likely to look into the incidents with both clubs likely to face charges with both teams threatening banning orders to any seen causing trouble.