The midfielder scored an audacious free-kick inside the opening ten minutes and then bagged the assist for Krystian Bielik's goal.
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In a set-piece identical to Fabio Aurelio's iconic strike for Liverpool against Chelsea in 2009, Mejbri stunned everyone at St Andrew's with an outrageous effort from distance.
The 20-year-old deceived goalkeeper David Button by firing a shot into the bottom right corner, with everyone expecting a cross.
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Mejbri broke into the United senior team in 2021 and made his Premier League debut under Ole Gunnar Solskjaer.
However, the Tunisia international was loaned out to the Championship following the arrival of Erik ten Hag - and it is not clear whether the midfielder is part of the manager's plans.
Speaking after the game, man-of-the-match Mejbri admitted he hoped the Dutchman was watching.
Mejbri told Sky Sports: "I just need to focus and stay focused… I'm sure he [Ten Hag] has Sky!
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"But I just need to focus until the end of the season and then we will see what happens in the summer."
Mejbri's free-kick in the Midlands derby marked his first ever senior goal - and the midfielder was also asked if there was any better way to get it.
"No I don't think so!" Mejbri replied.
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"It was a great game first, a good derby. And I had the chance to score and I'm very happy. The atmosphere was really nice so I just have to enjoy the moment.
"No message [from the manager to shoot], the only message was in my head. I saw that the keeper was a bit too high, so I acted like I was going to cross but I shot."