Cristiano Ronaldo was reportedly unhappy at his substitution late in the game against Xerez, as he bids to win the Pichichi (for top goalscorer).
Ronaldo scored two goals in the game and was aiming for his hat-trick when he was withdrawn shortly after scoring the second. Madrid scored a further 3 goals which according to reports made Cristiano unhappy.
Ronaldo is currently in the top-tier of the goalscoring charts alongside the likes of Lionel Messi (who scored a further two goals today), Zlatan Ibrahimovic and David Villa.