Dele Alli was at the centre of an unsavoury scene in the latest north London derby when the Tottenham midfielder was struck by a bottle thrown by an Arsenal supporter.
In the 73rd minute, with Mauricio Pochettino's side in cruise control after Alli made it 2-0, the English playmaker was hit by a plastic bottle launched by the crowd as tensions boiled over with the hosts facing a Carabao Cup exit.
Gunners defender Sokratis attempted to cool the situation by guiding Alli away from the sidelines and the crowd but the Tottenham midfielder could not risk biting back as he produced a 2-0 gesture which further riled home supporters.
Alli was walking down the touchline to collect the ball so he could get the game restarted with a throw-in.
But play was halted after a water bottle was thrown from a nearby Arsenal supported and referee John Moss quickly intervened in a bid to prevent unsavoury scenes dominating the encounter.
Tottenham were at the Emirates at the start of December in the league when they were beaten 4-2.
That was a match where both sets of players had to be separated by coaches and managers after a scuffle between substitutes and Tottenham's players following Eric Dier's goal.
And having exacted revenge in style - first Heung-min Son and then Alli, who produced a delightful lob over Petr Cech - Tottenham were not going to pass up the chance to taunt their hosts if the chance presented itself.