This is the moment on Saturday when two fans - one each from QPR and Birmingham - lost their heads - or in the case of the chap on the right - maybe his front teeth.
Another fan in the School End at Loftus Road has captured the one-hit punch up on a camera phone that went with another disgraceful bout of coin throwing - football's third such shameful scene in a week.
Rangers said the incident happened in the first half of the 2-0 win when one of their fans went toe to toe with a City supporter.
Scotland Yard are investigating a number of incidents of disorder at the match. Three people have been arrested, one on suspicion of pitch encroachment, and another on suspicion of racially aggravated assault on a police officer.
A spokesman said: “From around 14:30pm on Saturday, 27 February, a large number of Birmingham supporters caused a disturbance in Ellerslie Road near to Loftus Road Stadium.
Warning: Video contains use of strong language
“Cordons were put in place to assist police officers in ensuring public safety. In addition, officers used batons to restore order where the behaviour of supporters was violent and potentially dangerous.
“Two officers were injured. A number of supporters also sustained injuries and were treated by police medics. We are not aware of anybody receiving hospital treatment.
“There was further disorder inside the stadium, including missiles being thrown from the away stand towards home supporters. A QPR player was also struck by a coin thrown from the away stand.”
He added a fan of the west London club was later assaulted outside the stadium necessitating treatment for a broken nose.
A QPR spokesman said the club was assisting police with enquiries into the range of incidents including the on-pitch punch-up.
"In addition, both the club and the police are currently reviewing CCTV footage regarding the coin throwing incident which came from the away end following QPR's second goal,” he said.
“The club deplores the behaviour of those involved in the incidents and will continue to cooperate with the police to ensure the correct sanctions are made.”
Birmingham City responded with a telling statement about the press release distributed within minutes of the incidents.
“We note allegations of coin throwing arising from the match at QPR on Saturday and we stress that the Club will take the strongest possible action in dealing with any individual found to have indulged in such a deplorable act,” it said.
“The club also wishes to express its extreme disappointment that statements were released to the media during and after the match by QPR and Metropolitan Police without consultation with Birmingham City FC or West Midlands Police.”
A spokesman said the club would co-operate with the investigation, adding: “We abhor violence and anti-social behaviour at football matches.”