Damien Duff's 3rd-minute strike for Fulham last Saturday made us think about the other occasions when the Reds have fallen behind so quickly in home league matches.
Our research tells us Duff's effort was the seventh goal United have conceded in the first five minutes of a Premier League game at Old Trafford. How many of the other six can you recall?
It's good to know, by the way, that Sir Alex Ferguson's side bounced back to win five of the six games in question, just as the Reds did against Fulham.
Check out the answers here.
More United-based trivia questions: Goalkeepers meeting the Reds | Oldest scorers in Premier League | Internationals at Old Trafford | Old Trafford penalties | England's seven Reds | Alan Hardaker Trophy winners | Scored against United | United stars at European Championship | Goals for England | The name game | Non-appearance at finals