Things turned sour on and off the pitch as Manchester United lost to Brighton in their first Premier League game of the season.
Hope was high among United fans for the start of a new era under Erik ten Hag but they suffered a first ever home defeat to the Seagulls, who were deserved winners at Old Trafford.
Pascal Gross scored twice in the first half to give Brighton a commanding lead and while an Alexis Mac Allister own goal reduced the deficit after the break, Ten Hag's side could not complete the turnaround.