WATCH: Alberto Moreno enrages Liverpool fans by flipping a bottle on subs bench

Football is a vocation, Alberto. Don't you forget it.

Cast your mind back to this stage last season. Manchester United were travelling to Upton Park to take on West Ham United in a match that was crucial to their Champions League prospects. In the build-up to the game, United's bus was attacked which caused the kick-off to be delayed by 45 minutes. During this turbulent period, Jesse Lingard took to Snapchat.   Shocking. Almost as shocking as Alexis Sanchez smiling on the Arsenal bench in the closing stages of a heavy defeat to Bayern Munich. It is almost as if these footballers are not totally consumed with their professions. Alberto Moreno was an unused substitute as the Reds dropped two points in the race for the Champions League and in the 37th minute, rather than focus on the match, he decided to flip a water bottle. https://twitter.com/3rdEyeNot/status/861234839378440193 Given this was one of the most thunderously boring 0-0 draws every committed to history, Alberto seemed to passing the time quite innocently. After all, this is a divisive footballer who has been seen pushing a child's buggy while riding a hoverboard.   Still, we have reached the point of football's evolution where everything is infuriating. https://twitter.com/JOE_co_uk/status/861206234694897664 https://twitter.com/jebusf/status/861206276738621441 https://twitter.com/OwenWebbORourke/status/861226502490292224 https://twitter.com/aaroo_nnn/status/861228412387700736 https://twitter.com/Heidi_wba/status/861220151194247168 https://twitter.com/Shaulaann/status/861206319147008000