The former Alex Ferguson was the undisputed champion of football mind games but the current coach Louis van Gaal seems to be fairing far less well.
After Sunday's 1-1 draw between West Ham and United, the Hammers manager Sam Allardyce accused Van Gaal's side of playing long ball football.
If Allardyce was fishing then LVG took the bait hook, line and sinker. In today's press conference before United's game with Burnley, Van Gaal produced a dossier of statistical evidence to disprove Allardyce's claim, echoing the Liverpool manager Rafa Benitez's famous 'facts' rant. Here's how Twitter reacted to the events at Old Trafford.