Goals from Aaron Ramsey and Alexandre Lacazette secured a 2-0 win for Arsenal over Newcastle. Mustafi came in for some criticism for his performance. It was one moment in particular that had everyone laughing inside the stadium - including his team-mate on the pitch.
In the 68th minute Mustafi was seen bursting down the right wing as the Gunners were searching for a second goal to ease the pressure.
But in his attempts to cross the ball to his strikers in the box he inadvertently scuffed his effort as it went high and wide into row Z of the North Bank end.
Cameras showed the German defender being disappointed with himself before then panning to Aubameyang.
And the Gabon striker could be seen with a huge grin on his face, failing to keep a straight face at what he’d just witnessed.
His team-mate Pierre Emerick-Aubameyang couldn’t stop laughing at the incident and even tweeted a picture of an astronaut on the moon looking for a ball with the caption: “You can still see the world so it was not that far from the second post.”