The latest round of Champions League fixtures were heavily influenced by the new technology of VAR.
Manchester United's late controversial penalty in Paris was the biggest of all, with goals chalked off and an all manner of incidents also occurring in the other ties.
Fans and players are not convinced by VAR as of yet and it's far from being the 100% fool-proof system the game sorely needs - if one is even possible to create.
However, one piece of technology that is thought to be 100% reliable is that of goal-line technology.
It's been around for some years now and no one really seems to question it - why would they?
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In Juventus' brilliant 3-0 comeback win over Atletico Madrid, goal-line technology played a huge part, awarding the Bianconeri their second goal.
Cristiano Ronaldo's header appeared to be miraculously saved by Jan Oblak on first glance, but the technology confirmed that the ball had crossed the line.
Fans at home were then handed the customary enhanced image of the ball just over the line.
But today, a video from one Atletico fan has been doing the rounds on social media appearing to dismiss the idea that the ball had crossed the line.
You can watch the footage below and decide for yourselves whether you think it's nonsense, or whether @Cholo14Rey is on to something.
The user claims that the line drawn was narrower than it should have been, the dot used in the footage was smaller than the ball and the boundaries of the ball were slightly incorrect.
After putting all three of those supposed 'errors' together, the Atleti fan claims that the technology was false and that the goal should not have counted.
We're not entirely convinced...
However, a similar issue was raised during Manchester City's 2-1 win over Liverpool back in January.
John Stones cleared the ball off the line that night, but there was a school of thought that depth perception deceived the technology and the ball had crossed the line.
Do you think goal-line technology needs to be reviewed and perhaps altered? Have your say in the comment box below.