Antonio Conte is known for showing his passion on the touchline.
But he outdid himself after watching Eden Hazard score one of the most important goals of the season for Chelsea against Arsenal on Saturday lunchtime.
The Belgian forward scored a sensational goal in the 53rd minute, picking the ball up in his own half before driving his way past three Arsenal players - leaving Francis Coquelin on the floor - before firing past former team-mate Petr Cech.
It sent Stamford Bridge into raptures during the vital London derby and prompted a superb celebration from his head coach.
Conte rushed from the technical area and threw himself into the crowd, legs in the air, to celebrate with the home fans.
"He's mad," said Sky Sports commentator Gary Neville as he watched the incident unfold.
See Conte's celebration for yourself by hitting play on the video at the top of the page.