You might think Manchester United's success under Sir Alex Ferguson was down to their supreme talent, work ethic, or tactical nous.
But Wayne Rooney has offered an alternative suggestion.
The former striker says that playing together on PlayStation on the team bus was a substantial part of building their togetherness on the field.
A portable version of PlayStation, PSP, came out in 2004 and Rooney will be grateful as he went on to win five Premier League titles and a Champions League with the club.