With the endless possibilities for upsets by smaller clubs, the most unlikeliest of teams and players can have their moment in the sun. Just think of Ronnie Radford and Hereford United in 1972!
Even at the other end of the footballing scale the Cup can be a valuable way of ending the season with a shiny trophy in the cabinet.
Which is exactly what tomorrow's final can provide for two of the biggest teams in the land.
While Chelsea have failed to reach the golden top 4 this season, Manchester United have hardly had a memorable season, having spent heavily last summer.
Add to that the spice of this undoubtably being Chelsea boss Antonio Conte's last match in charge before the inevitable chop. AND Jose Mourinho facing his old club!
It could of course descend into a tactical bore, with both managers reverting to their defensive instincts, but lets hope its a corker!
And if you know your history, take a look at my exclusive retro artworks of both clubs.
Packed with memories of these two unique teams.
Retro Chelsea featuring Peter Osgood, Peter Bonetti, Bobby Tambling, Roy Bentley and going back even further 1920s star Andy Wilson and 30s striker George Mills.
Retro Manchester United, with George Best, Bobby Charlton, Denis Law, Alex Stepney, Bryan Robson and Norman Whiteside.
King's Road legend Peter Osgood, was an F.A. Cup winner with Chelsea in 1970, scoring in the replay played at Old Trafford. He also won another winners medal with Southampton in 1976, ironically against Man Utd.
It would be wonderful to see these two players in the modern game. Their transfer values would be insane!!