Want to tell an annoyingly vociferous fan to pipe down? A casual slap in the back of the head will suffice.
WARNING: This tactic may only work if you’re one of the most famous players in the world.
The shocked fan’s reply appears to have been along the lines of: “Hey Messi, I’ve paid for my ticket, I can say what the hell I want!”
UPDATE: Apparently this wasn’t a fan, but a member of Barca’s staff. Phew, thought Messi was turning into a bit of a big-headed dickface, but not the case, on this evidence anyway