West Ham came out on top in midweek as the dust settled after an end-to-end London derby with Chelsea, knocking the Blues out of the EFL Cup with a 2-1 win.
They have earned themselves a place in the quarter-finals - and an exciting trip to Old Trafford, where they will hope to overcome the favourites once again and inch their way towards the final.
Here are five things we learned from the win.
Slaven Bilic wants to play exciting football
Nobody who saw West Ham play against Chelsea can accuse them of parking the bus and hitting their opposition on the break.
It was an exciting, end-to-end game full of chances, and West Ham emerged victorious from the rubble. Many a manager would have come into the fixture and tried to nick a victory, but Bilic came out all guns blazing.
He does not want his side to play like a 'small team'. Instead, he wants them to go toe-to-toe with their opponents.
Sometimes this has been to their detriment, as the number of goals they have conceded in the league shows. However, it is an admirable (and certainly entertaining) approach, and when he gets his personnel right and playing well, it can work a treat.
The new 3-4-3 formation he is employing is getting the best out of many of his players, allowing for a dynamic, attacking system to flourish.
Michail Antonio, Dmitri Payet and Manuel Lanzini are not a bad front three
Speaking of attacking football, West Ham's front three of Payet, Antonio and Lanzini looked dangerous all evening against Chelsea.
With the Hammers struggling for a striker, Antonio has demonstrated the capacity to operate as the central figure in a fluid three-pronged attack. Simone Zaza has not hit the heights yet, Andre Ayew has not seen much of the pitch due to injury, and the less said about Andy Carroll's knee the better.
He has played as a striker before, and his athleticism and power make him a good fit for the role. He does not play as a traditional striker, though, and freely interchanges positions with Payet and Lanzini either side of him, making for an unpredictable attacking trio.
If the three can consistently provide goals, then Bilic will feel more relaxed about easing his other attacking options into the team without worrying about a lack of goal threat.
The goals can come from anywhere
It is not just the forwards who can score goals in this West Ham team. Despite the impressive play of the front three, it was Cheikhou Kouyate and Edimilson Fernandes who grabbed the goals against Chelsea.
Kouyate, playing at centre-half, produced an incredible header from just inside the box, looping Mark Noble's cross into the far corner with pace, just clipping the inside of the post on its way into the net.
Youngster Edimilson Fernandes made it two just after half-time as he fired a low shot across goal from the edge of the box and past Asmir Begovic.
The versatility of many of these players means that they are comfortable in multiple areas of the pitch, and can often contribute offensively despite being defensive players.
For example, Kouyate played as part of the back three, but is also comfortable as a central midfielder. Fernandes, who played as a wing-back, can also play in the centre of midfield. This creates a multi-faceted team that can be dangerous in multiple ways.
The London Stadium is not home just yet
Crowd trouble has been an unfortunate theme of West Ham's home games this season, and a London derby was unlikely to produce better behaviour.
Having moved from their beloved Upton Park, it seems both the team and the fans are still adapting to their new surroundings.
The Hammers struggled with home form at the beginning of the season, winning just one of their first four home games in the league.
However, more results like this will go a long way towards writing some history for the London Stadium, and make it feel more like home - and hopefully eradicate the unrest that has been on display in the crowds of late.
Their gung-ho approach will make or break them over the next few games
West Ham's open game plan will be sorely tested over the next six league fixtures. Their win over Chelsea was an excellent result, but if they are to cede as many chances to their opposition in the next few league games, they may come away with fewer points than they might hope.
The Hammers come up against: Everton (A), Stoke (H), Spurs (A), Manchester United (A), Arsenal (H), and Liverpool (A).
That is a gruelling run for any team. It will be interesting to see if Bilic sticks to his gung-ho approach, or changes his tactics to suit his opponents.
Have something to tell us about this article?