From verbal spats to shoving matches - we've seen it all from bitter rivals Jose Mourinho and Arsene Wenger.
Since his first stint in England, the Chelsea boss got under the Frenchman's skin, and has managed to stay there over the years.
With Chelsea set to travel to the Emirates on Sunday, where they will be facing the rejuvenated Gunners, Wenger will be hoping to finally get one over on his arch-rival.
The Arsenal boss has not recorded a single win from 12 games vs Mourinho, with the Blues having the clear advantage, winning seven and drawing five, whilst scoring 21 goals to Arsenal's six.
These two managers have delivered several priceless quotes during their long-running feud, here are some of the best.
10. February, 2005 - Wenger Defends Fielding Squad of Non-English vs Crystal Palace
"Take what Arsenal and Chelsea have won in the past eight years. I go with reality, with the football we play and the challenge we have ahead."
"I don't see especially that Chelsea play more English players than we do. Who have they produced, homegrown? Just one, John Terry."
9. August, 2005 - Wenger Blasts Mourinho's Conservative Tactics
The Frenchman accused Mourinho of using negative tactics to gain results.
"I know we live in a world where we have only winners and losers, but once a sport encourages teams who refuse to take the initiative, the sport is in danger."
8. October, 2005 - Mourinho's Patience Runs Out After Wenger Complains About Chelsea Transfers
"I think he is one of these people who is a voyeur. He likes to watch other people. There are some guys who, when they are at home, have a big telescope to see what happens in other families. He speaks, speaks, speaks about Chelsea."
7. November 2005 - Wenger's Pride Hurt After Being Branded a 'Voyeur'
"He’s out of order, disconnected with reality and disrespectful. When you give success to stupid people, it makes them more stupid sometimes."
Mourinho defended his actions, claiming to have a huge list of Wenger's quotes on Chelsea.
"At Stamford Bridge, we have a file of quotes from Mr Wenger about Chelsea football club in the last 12 months - it is not a file of five pages. It is a file of 120 pages so we have a very strong reaction. My objective is that it is enough."
6. April, 2007 - Prior to Arsenal Losing Carling Cup Final vs Chelsea
The Arsenal boss makes thinly veiled barb at Mourinho.
"If you would like to compare every manager you give each one the same amount of resources and say: ‘you have that for five years’. After five years you see who has done the most."
5. November, 2007 - Jose Hits Out at Arsenal Transfer Policy
"Unlike Arsenal, we sought success and tried to build it through a concept of the game using English players." Jose said in his then new book, Born Winner.
The manager claimed that he built a club with the right mix of English and foreign players through careful management.
4. April, 2008 - Mourinho Brings Up the Stats
Seven Months after leaving Chelsea, the Portuguese tactician couldn't help but take a swipe at his old nemesis.
"The English like statistics a lot. Do they know that Arsene Wenger has only 50 per cent of wins in the English league?"
3. November, 2010 - Wenger Slams Mourinho, Claims Portuguese Is Damaging Football
The Frenchman was less than impressed after Mourinho allegedly instructed his Real Madrid players - Xabi Alonso and Sergio Ramos - to deliberately get themselves carded during a Champions League tie.
"You never say it doesn’t cross your mind but when you see how it looks on television it is the best demonstration to think: “Never do that again”.
"It looks, frankly, horrible. It’s a pity to see that from a big club."
2. November, 2010 - Mourinho Responds to Wenger's Criticism
"Instead of speaking about Real Madrid, Mr Wenger should speak about Arsenal and explain how he lost 2-0 against a team in the Champions League for the first time [Braga]. The history about the young kids is getting old now. Sagna, Clichy, Walcott, Fabregas, Song, Nasri, Van Persie, Arshavin are not kids. They are all top players."
1. February, 2014 - Mourinho Pulls Out His Best One Yet, Referring To Wenger as a Specialist In Failure
Mourinho responds to Wenger's claims that managers were playing down title chances because they were 'afraid to fail'.
"If he is right and I am afraid of failure it is because I didn't fail many times. Eight years without silverware, that's failure."
"He's a specialist in failure, If I do that in Chelsea, eight years, I leave and don't come back."