With the Madrid derby finely balanced heading into the last 15 minutes, Ateltico Madrid winger Arda Turan was very harshly sent off by German referee Felix Brych.
The Turkish midfielder, already on a yellow card, was judged to have left his foot in high on Sergio Ramos - the man who had acted as chief wind-up merchant throughout the game.
But replays showed that Turan barely touched the Spaniard, who proceeded to roll around on the floor as if his toe had been broken.
Shown the red card, Turan was incensed with Mr Brych who left Atletico facing the final minutes of the game with just 10 men.
Here is some of the best reaction to the red:
Atletico continued to fight but found their resistance broken by Javier Hernandez with just two minutes to go, with Real eventually reaching the semi-finals after a tense ending.
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