"Hazard is sent off for kicking the ball under a ball boy attempting to smother the ball rather than return it, " Chelsea's tweet read.

NPR: Chelsea Star Ejected For Kicking At Ball Boy

Plus, rather than kicking the ball with your foot, where you at least have some level of sensitivity, you strike it with the bony part of your heel.

WSJ: Soccer: Socrates, Brazil's Philosopher King - Marcotti