Legendary Sir Alex Ferguson was berated by a Manchester City fan as he left the Etihad Stadium on Sunday.
The former Aberdeen and Manchester United boss, widely regarded as the game's greatest ever manager, was in attendance as his old team were thumped in the Manchester derby.
United have never recovered from his retirement in 2013 and he was seen shocked in the stand as Ralf Ragnick's side stuttered to a 4-1 thrashing at the hands of the league leaders.