Liverpool take on Chelsea in Saturday's FA Cup final at Wembley.
The Merseysiders knocked United out of the competition after Sir Alex's side had disposed of Manchester City in the third round.
Although all Reds fans will probably be hoping for victory for the Londoners at the weekend, it got us thinking about when United have lost to the eventual winners of the final.
Not counting the final itself, which FOUR teams have beaten United on the road to the showpiece event and ended up lifting the FA Cup since the turn of the century?
Click here for the answers and look out for another poser next Thursday.