Arsenal failed to make up any ground on the Premier League's top four on Sunday after being held to a 1-1 draw by West Bromwich Albion.
Alexis Sanchez's deflected free-kick put Arsene Wenger's men ahead seven minutes from time, however they dropped two points after a controversially awarded penalty.
In the 89th-minute, referee Mike Dean gave West Brom a spot-kick after deciding that Calum Chambers intentionally handled Kieran Gibbs' cut-back inside the area.
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Dean has built up a reputation for making himself the centre of attention during games, and the final Premier League clash of 2017 left everyone talking about what he did.
Chambers left fuming with Dean
Whilst all of Arsenal's players were livid at the decision, the most angry was probably the unlucky culprit Chambers, and fans noticed what he said after Jay Rodriguez equalised.
The 22-year-old would have been desperate to put in a solid performance at The Hawthorns in what was just his second league appearance of the 2017-18 campaign.
However, the English centre-back ended up producing a costly albeit unfortunate error and it's safe to say that he was fuming with Dean when the Baggies levelled the scores.
What Chambers shouted at Dean
After Rodriguez's penalty hit the back of the net, the cameras immediately went onto Chambers, and he could be seen shouting "That's a f***ing disgrace!" towards 49-year-old Dean.
Chambers had every right to feel hard done by, but some people on Twitter who spotted his outburst believe he could receive a ban for his foul language.
In addition to Gunners manager Wenger, Petr Cech also delivered an emotional post-match interview regarding the penalty, and his full-time protests earned him a yellow card.
Even for those who think Chambers' handball was deserving of a penalty, surely everyone can agree that it was incredibly soft, and ultimately cost Arsenal a vital victory.
The north London club host champions Chelsea on Wednesday before an FA Cup tie at Nottinhgam Forest and the Carabao Cup semi-final first leg at Stamford Bridge.
What do YOU make of Chambers' outburst at Dean? Do YOU think it deserved to be a penalty? Have YOUR say in the comments box below!