Casillas responds to Twitter user's 'mannequin challenge' dig
FC Porto keeper Iker Casillas became involved in a social-media spat on Thursday night after receiving criticism from a football fan.

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FC Porto goalkeeper Iker Casillas has bitten back at a social media user who criticised him with a reference to the recent 'mannequin challenge' craze.
Iker "the boss" of the 'mannequin challenge'
Nadie sabe que el jefe de el mannequin siempre fue casillas con sus estatuas mirando el balón... @IkerCasillas Saludos crack
— Hermo (@diegohermo7) November 17, 2016
In a Twitter message on Thursday, user @diegohermo7 said of the World Cup-winning ex-Spain captain: "No-one realises that the boss of the mannequin [challenge] has always been Casillas, with his statue-esque poses as he watches the ball..."
Casillas swiftly hits back
And Real Madrid legend Casillas, who regularly replies to tweets directed at his official account @IkerCasillas, was quick to respond to the jibe.
antes de dormir, ponte el vídeo...pilla papel y boli y saca apuntes...ya te preguntaré la lección... pic.twitter.com/zfqyjULwAR
— Iker Casillas (@IkerCasillas) November 17, 2016
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In a post accompanied by a video of some of his finest saves during his career, the 35-year-old wrote: "@diegohermo7, before you go to sleep, play this video...grab a pen and piece of paper and take notes... [then] I'll ask you what you've learned".
User comes back at keeper with another video
But the tweeter was not discouraged by Casillas' retort, returning with a video of some of his less glorious moments, with the quip: "Surprise exam for you too..."
Examen sorpresa para ti tambien, pero iker, no le digas a la prensa que te filtrado las respuestas....⚽✋👐 pic.twitter.com/7ZElRXA76E
— Hermo (@diegohermo7) November 17, 2016