Andre Onana celebrated in front of Lyon's away fans after Man United opened the scoring in the second leg of their Europa League quarter-final clash.
Manuel Ugarte made it 1-0 within 10 miunutes when he fired in from close range following Alejandro Garnacho's driven pass across the box from the right flank.
Onana then walked towards his own corner flag in front of the south-east stand at Old Trafford where the away fans sit, and laughed in celebration.
This comes just a week after his double howler in the first leg of the tie denied United victory, as they were held to a 2-2 draw in France.