Never mess with Javier Mascherano. Neymar really should know that by now.
The Barcelona pair have been at war of late, after a video emerged of the Brazilian and cohort Luis Suarez bullying Mascherano in training.
The former Liverpool and West Ham star later tweeted that he would have his revenge against the pair, and it looks like revenge has come in the form of a slap round the head of an unsuspecting Neymar.
The pair were warming up in training ahead of their showdown against Getafe this afternoon, and while Neymar was limbering up, Mascherano saw his chance to strike.
The Argentinian snuck up behind his victim before giving him a club around the head - and duly ran off like a schoolgirl. Where did he get that reputation as a defensive hardman from again? You can check out the video below.
Barcelona will hope the high spirits off the pitch will translate to points on it as the Catalan club take on Getafe today.
Luis Enrique's side are currently flying high in La Liga with eight points separating them from second-place Atletico Madrid. Rivals Real Madrid are a further four points back in third place.
They also look well placed to progress in the Champions League after taking command of their last-16 tie against Arsenal with a 2-0 victory in the first leg.
Key to their success this season has been the form of Neymar, Suarez and of course Lionel Messi - who between them have managed an incredible 100 goals this term in all competitions.