Sir Alex Ferguson can be a good friend but a very bad enemy.
It is better to have the Manchester United manager on your side because the Scot has a memory that makes an elephant seem forgetful, which Wayne Rooney is discovering.
As Rooney recovers from a gash in a leg that may sideline him for up to two months, the striker would be well advised to take a long, hard look in the mirror before resuming his United career.