Sir Alex Ferguson's main enemy throughout his illustrious 26-year tenure as Manchester United boss was undoubtedly Liverpool.
The former United manager infamously vowed to "knock Liverpool off their f****** perch" in 2002 and was rarely in for a warm welcome whenever he made the trip to Anfield.
But his relationship with one former Reds star was particularly frosty for the best part of two decades after he accidently overheard a joke made at his expense.
