Los Blancos appeared to think victory was a foregone conclusion, but there was no cause for celebration in the end
The Santiago Bernabeu side missed out on the Champions League and La Liga title earlier this term, yet they were optimistic about their chances of ending the season on a positive note ahead of the clash with their fierce city rivals.
But, Jose Mourinho and his men were dealt a huge blow at the Bernabeu as Atletico emerged victorious after extra time to end their 14-year winless streak against los Blancos (2-1).
The shock-defeat meant Madrid's planned celebrations were cancelled, with the open-top bus they had arranged returning to the depot without being used.
The bus, decorated with banners reading "Champions 19th Copa del Rey. Thank you Madridistas", was spotted driving through the streets of the Spanish capital on its way back to the depot, with pictures of the vehicle going viral on various social media networks.
Atletico's victory sparked wild celebrations in the red and blue half of the city on Saturday, with players joining fans in the streets after a bus tour of their own.