Manchester United had the perfect opportunity to pull away from the chasing pack on Saturday night against Leicester City, but they blew it.
Chelsea, Liverpool and Arsenal all dropped points ahead of the game at the King Power Stadium, although Tottenham secured an impressive 3-0 win away to Burnley.
It meant that United could move five points clear of third-placed Chelsea and cement their place in second, behind the untouchable league leaders Manchester City.
And for 93 minutes it seemed Jose Mourinho's men were well on their way to three points, with Juan Mata's brace cancelling out Jamie Vardy's opener.
But in the dying seconds of the game, Marc Albrighton swung a lovely cross into the box for Harry Maguire to poke past David de Gea and make it 2-2.
United's players looked gutted. They'd done so well to recover from 1-0 down away from home, but a lapse in concentration when it mattered most cost them dearly.
Frustrations have since boiled over amongst United fans for a number of reasons, one being that Chris Smalling, who was injured in the final few minutes, was marking Maguire.
Another is that when Ander Herrera came on in the 76th minute to defend their lead, the Spaniard refused to play right-back and told Henrikh Mkhitaryan to play there instead.
Not exactly what you'd call being a team player.
It turns out Herrera was a source of frustration for his teammates, too, judging by some footage that's emerged from the 88th minute.
In the video below, Herrera wins back possession in midfield and passes to Lukaku, who attempts to return the favour only to realise Herrera hasn't continued his run.
Lukaku was understandably furious and angrily gesticulated to his Spanish teammate as Leicester prepared to launch another attack. Check it out.
LUKAKU LOSES IT WITH HERRERA
It takes a brave man to argue with someone of Lukaku's build and Herrera tried to do just that, but he was in the wrong and should have offered the one-two.
Here's how United fans reacted to the incident.