Sorry Nacho - can;t agree with that. If things aren't going our way (which is pretty often) then our fans will walk out at 70-75 minutes. When we played Sheff Utd at home, the crowd were on the players backs from the moment Sheff Utd scored until Rodwell's goal - we had 3 minutes after the goal and the ones that were left got behind the team and the team played much better.Not a well known fact no, more like a myth based off one time that tv cameras picked up a group of blokes going downstairs after conceding around 70 mins. I don't have eyes all around the ground but when I go to games, when we've lost people around me leave after 85 mins or so, same as any other ground.
I haven't inspected the facts but much like Arsenal home games when United play at home the crowd only seems to raise above a whisper when they're either 3-0 down or 3-0 up at which point they spring to life.
Crowd are the 12th man - our crowd are normally the 12th man for the opposition at the moment
