Ander Herrera was furious with Marcus Rashford after the striker elected to attempt a flamboyant back-heel rather than pull the ball back for an easy tap-in.
The Manchester United striker was picked to lead the line against Southampton as Jose Mourinho switched to a rather makeshift and experimental 5-3-2 – though his side nearly went ahead within minutes.
Saints keeper Alex McCarthy miskicked the ball horribly, presenting the ball to Rashford, though he was a little too slow to react to the situation.
With the ball drifting towards the byline, Rashford tried an outrageous back-heel when he could have taken his time and squared to either Herrera or Romelu Lukaku.
That allowed Southampton defender Maya Yoshida to gobble up the ground and swoop in in front of Herrera, intercepting the wayward attempt at a pass.
Yoshida had barely even cleared the ball before Herrera started gesticulating angrily at Rashford, seemingly in disbelief that he had failed to pick him out.
The ball ricocheted nicely to Lukaku, whose own effort was saved by McCarthy, but while the ball was still in player Herrera turned back to Rashford to complain at him again for his poor pass.
Rashfords evening got even worse when he gave away a free-kick on the edge of the area after a poor touch that was clinically dispatched by Cedric Soares, but he redeemed himself with a pair of brilliant assists in a thrilling first half at St Marys.
More: Manchester United FC