When will Arsene Wenger learn?
This time last year, the Frenchman was slammed by fans and the media alike for playing David Ospina in the Champions League when Petr Cech was fit to play.
Well, he clearly hasn't learned his lesson after deciding to do the very same against Paris Saint-Germain tonight.
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In fact, Arsenal's starting line-up was full of surprises, with Alexis Sanchez preferred to Olivier Giroud up front and Granit Xhaka started on the bench.
Fans were understandably furious upon hearing the news that Cech had been replaced by Ospina but, prior to the clash in Paris, Wenger explained his decision.
In an interview with BT Sport - which you can watch below - he said: "I think I have two world-class goalkeepers.
"We analysed last season and this season and I decided to play him tonight, yes."
Interesting. So in Wenger's mind, Ospina is world-class and deserved to start ahead of Cech - one of the Premier League's best ever goalkeepers - based on pre-match analysis.
If you say so, Arsene.
Arsenal's manager could be made to pay for dropping Cech, especially so after watching his side concede after 42 seconds. Edinson Cavini was the goalscorer, latching onto Serge Aurier's brilliant cross to head into the bottom-left corner.
Ospina was called into action soon after PSG's opener when Angel Di Maria's inswinging corner threatened to lob him at the back post.
To the Colombian's credit, he produced a fine save to tip the ball over the bar.
At the time of writing this, Arsenal were 1-0 down and under considerable pressure from their French opponents, who were visibly more energetic and hungry in the opening 20 minutes.