Was it a penalty?
Atletico Madrid's Diego Costa went to ground in the Real Madrid box in the 11th minute under pressure from Real defender Sergio Ramos.
The referee waved play on as Atletico's players argued and gestured angrily. Arda Turan was booked for dissent.
See the incident yourself in the GIF below (h/t Reddit).
So, was it a penalty? Let us know in the comments.