A mad few minutes saw the Gunners score, only to have it chalked off by video officials - who then awarded a spot-kick, which was converted
VAR has been a regular source of controversy ever since being introduced in the Premier League, and it caused confusion again in the first half of Arsenal against Manchester United on Saturday lunchtime.
Eddie Nketiah appeared to have put Arsenal 2-0 ahead against Man Utd - but VAR disallowed it for offside, only to give a penalty to the Gunners instead, which Bukayo Saka scored.
There was then further controversy when Arsenal defender Cedric Soares clearly handled the ball in the Gunners penalty area, but nothing was given.
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So why did this strange series of incidents occur and what decisions were made? GOAL takes a look...
Watch: VAR disallows Arsenal goal but awards penalty (UK only)
Arsenal appeared to have gone two ahead of Man Utd in a crucial battle for the Premier League top four, when a slick Martin Odegaard pass from midfield was flicked on by Saka for Nketiah to finish by David de Gea.
However, the referee was instructed by VAR that Nketiah was in an offside position when he got the ball, so the goal was disallowed - but matters did not stop there.
As Saka flicked it on, he was clumsily fouled by Alex Telles, and so on-pitch referee Craig Pawson was summoned to look at the incident on his pitchside monitor.
The penalty was given after video review, and was dispatched by Saka to put Arsenal 2-0 up - albeit not in the manner they originally expected.
What about the Cedric handball?
In the first half, the Arsenal right back went to the floor under pressure from Jadon Sancho. As Cedric clambered on all fours to try and get back on his feet, his hand made contact with the ball.
Despite television cameras clearly picking this up, VAR did not call on Pawson to review the incident - with Sancho and his Man Utd team mates left roaring in frustration.