Guendouzi and Iwobi duck so fans can watch Pierre-Emerick Aubameyang’s penalty
They went on to win the match 2-0 and moved into fourth place in the Premier League
Matteo Guendouzi and Alex Iwobi were warming up at the side of the pitch as the striker stepped up to take the penalty when they responded to pleas from the home support.
A number of supporters had their view blocked by the two substitutes, as some shouted out for them to move.
Fortunately, they heard their calls and ducked down to the ground, leaving fans in hysterics.
The pair even began doing press-ups while they waited for referee Jon Moss to let Aubameyang take the penalty, which he scored.
Earlier in the match, Granit Xhaka opened the scoring when his 12th minute shot bamboozled United goalkeeper David De Gea.
The Gunners leapfrogged the Red Devils after the 2-0 win to move into fourth place in the Premier League with the win.