It's arguably the fiercest rivalry in all of football—the very best against the very best, and to top it all off, both teams hate each other.
For the neutral, it's a fascinating watch as the stakes are always so high. The media circus, the manager mind games, the world-class players—everything is always in place for a classic confrontation.
Saturday's El Clasico is no different, and with the La Liga title still very much in the balance, the game will certainly not be for the faint-hearted.
Ask 99 percent of Barcelona fans about Real Madrid and their answer will almost certainly contain real venom and hatred towards their arch-enemy.
Here are five reasons why...