The world of football has a dark underbelly, where teammates can turn into opponents in the blink of an eye. From slapping each other on the pitch to planting their heads into their comrades' faces, we take a look at the most infamous cases of intrasquad violence.
In 1978, Derek Hales and Mike Flanagan's spat during an FA Cup match against Maidstone was so intense that it resulted in both players being sent off. Hales had had enough of Flanagan passing to him reluctantly, prompting a violent confrontation that left both men with a red card.
Fast forward to 1994, when Craig Levein and Graeme Hogg's pre-season friendly turned into a brawl after Raith Rovers' Gordon Dalziel almost scored. The two Hearts defenders traded punches, with Levein throwing haymakers that Dalziel described as "superb" and Hogg ending up with a broken nose.
The 1990s were also marked by some gruesome incidents, including Graeme Le Saux and David Batty's clash during Spartak Moscow's Champions League campaign. Le Saux tried to punch Batty in the neck before Tim Sherwood intervened, but no action was taken by the referee.
In a bizarre incident, Jens Lehmann reacted badly to a Schalke goal against Dortmund, trying to strangle his teammate Marcio Amoroso. The goal that so enraged Lehmann was disallowed for offside, but the violence still counted: Lehmann was sent off.
More recent incidents have also made headlines, including Lee Bowyer and Kieron Dyer's physical altercation during Newcastle's 3-0 defeat by Aston Villa in April 2005. And then there's Idrissa Gueye's infamous red card for slapping Michael Keane at Old Trafford.
One player can eclipse Gordon on both fronts is Essam El-Hadary, who made his international debut against South Korea in March 1996 but didn't appear between the sticks until 22 years and three months later at the 2018 World Cup. Another example of a long wait for an international debut is Pia Sundhage's 15-year-old debut for Sweden in 1975.
When it comes to thrashing champions, Forest's 3-0 win against Liverpool remains one of the most shocking results in Premier League history. Other notable examples include Manchester City's 6-1 defeat of United at Old Trafford in 2011 and Spurs' 4-0 win over Leicester in May 2017.
The knowledge archive has some fascinating questions, including whether a team or manager combo has qualified for both the World Cup and international cocktail cabinets. We'll have to wait and see if readers can help us crack this one!
Lastly, we have some queries from our readers that need answering: Has any player been shown a second yellow card for not leaving the pitch correctly? Can you help with these questions and more in our knowledge archive?
In 1978, Derek Hales and Mike Flanagan's spat during an FA Cup match against Maidstone was so intense that it resulted in both players being sent off. Hales had had enough of Flanagan passing to him reluctantly, prompting a violent confrontation that left both men with a red card.
Fast forward to 1994, when Craig Levein and Graeme Hogg's pre-season friendly turned into a brawl after Raith Rovers' Gordon Dalziel almost scored. The two Hearts defenders traded punches, with Levein throwing haymakers that Dalziel described as "superb" and Hogg ending up with a broken nose.
The 1990s were also marked by some gruesome incidents, including Graeme Le Saux and David Batty's clash during Spartak Moscow's Champions League campaign. Le Saux tried to punch Batty in the neck before Tim Sherwood intervened, but no action was taken by the referee.
In a bizarre incident, Jens Lehmann reacted badly to a Schalke goal against Dortmund, trying to strangle his teammate Marcio Amoroso. The goal that so enraged Lehmann was disallowed for offside, but the violence still counted: Lehmann was sent off.
More recent incidents have also made headlines, including Lee Bowyer and Kieron Dyer's physical altercation during Newcastle's 3-0 defeat by Aston Villa in April 2005. And then there's Idrissa Gueye's infamous red card for slapping Michael Keane at Old Trafford.
One player can eclipse Gordon on both fronts is Essam El-Hadary, who made his international debut against South Korea in March 1996 but didn't appear between the sticks until 22 years and three months later at the 2018 World Cup. Another example of a long wait for an international debut is Pia Sundhage's 15-year-old debut for Sweden in 1975.
When it comes to thrashing champions, Forest's 3-0 win against Liverpool remains one of the most shocking results in Premier League history. Other notable examples include Manchester City's 6-1 defeat of United at Old Trafford in 2011 and Spurs' 4-0 win over Leicester in May 2017.
The knowledge archive has some fascinating questions, including whether a team or manager combo has qualified for both the World Cup and international cocktail cabinets. We'll have to wait and see if readers can help us crack this one!
Lastly, we have some queries from our readers that need answering: Has any player been shown a second yellow card for not leaving the pitch correctly? Can you help with these questions and more in our knowledge archive?
it's wild to think about how many times players just lose their cool on the field... i mean, who needs a sports psychology degree when you've got a red card waiting for you, right? 
anyway, can we talk about why these guys are still making headlines 20+ years later? is it because they're just that memorable or 'cause our collective nostalgia for football just makes us forget how messed up the game can be sometimes? 
idk
. That was low-key crazy talk. Anyway, back to the topic - it's interesting that you mentioned Essam El-Hadary and Pia Sundhage, but what about other record-breakers? Like, did you know that there are also female cricketers who've taken a 20-year break between international appearances 
And then you look at the history, and it's like... okay, so Derek Hales and Mike Flanagan were sent off in '78, that's pretty wild. But to see guys getting sent off for slapping each other, or just being super aggressive... I don't know, it just seems so... unnecessary 
. And then you've got Jens Lehmann trying to strangle his teammate... that's just crazy 
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. Strangling his teammate like that is just wild. I mean, I know he was upset, but come on! 2 red cards for him already in a single match against Dortmund and now you're adding this? 
. The fragility of human emotions and the pressure to perform can sometimes lead to unexpected outbursts 
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like that one goal at Dortmund that made Jens Lehmann lose his cool... and then he just went for the throat 
. Can't say I blame him, though - 6-0 losses are brutal 
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Something doesn't add up, if you ask me. And have you noticed how often these incidents happen after a goal is scored or disallowed? It's like they're trying to distract us from something else... 
. I mean, who gets sent off for just passing the ball to their teammate reluctantly like Hales did back in 1978? It's not like it was a full-on tackle or anything... And what's with all these old incidents being pulled out of nowhere? Can't they just focus on the present and the actual matches being played instead of digging up dirt from decades ago? 
. And can we talk about Jens Lehmann's anger issues for a second? Strangling his teammate? What was he thinking? 
. Seriously though, it's crazy to think about how intense some of these incidents must have been. Like, who tries to strangle a teammate after a goal is disallowed? 
players can get super angry on the pitch & it's crazy 
fun fact: did you know there are players like Essam El-Hadary who wait YEARS for an international debut? 22 years and 3 months is insane 
it's wild when teams get thrashed by other teams 
like Forest beating Liverpool 3-0 or Manchester City getting destroyed by United 6-1 
can you believe players got sent off for just playing with their hands? 
jens lehmann trying 2 strangle his teammate marcio amoroso tho thats low