George Weah, Gabriel Heinze, Claude Makelele, Hatem ben Arfa and Lorik Cana, five men who braved the wrath of Paris Saint-Germain and Olympique de Marseille fans by crossing the Classique divide.
ligue1.com looks at the bold quintet who have felt what it's like to be on both sides of Ligue 1 Uber Eats' biggest game.
George Weah PSG 1992-95, OM 2000-01
Now the President of Liberia, Weah was one of the greatest players of the last decade of the 20th century. After a four-year, goal-filled spell at AS Monaco — his first European club — he joined PSG, forming part of the team that won the French title in 1994 as well as the Coupe de France either side of that triumph.
The 1995 Ballon d'Or winner scored 31 times in 96 league matches for the capital club, but — having played for AC Milan, Chelsea and Manchester City — was less successful when he returned to France in 2000.
He netted five times in 19 league games for OM, and was involved in the 1-0 home win over PSG in the 2000-01 campaign, his only triumph in the Classique for either side.
Hatem ben Arfa OM 2008-11, PSG 2016-18
"PSG have always had a very special place in my heart," said the hugely talented attacking midfielder, who was born in the Paris region, when he signed for the club in 2016.
It was the fulfilment of a childhood dream, but one that would turn sour. He made just 23 league appearances in the 2016-17 campaign before he was frozen out of the first-team squad by coach Unai Emery, a situation that would last until the expiry of Ben Arfa's two-year contract in summer 2018.
His two-year spell at OM had been happier. Having left Olympique Lyonnais in 2008, he scored six goals in 33 league appearances as Eric Gerets' men finished runners-up to Girondins de Bordeaux. He then netted three in 29 top-flight outings as Marseille reeled in Bordeaux to take the title the following season under Deschamps.
WATCH: Three goals, three points for OM at the Parc
Gabriel Heinze PSG 2001-04, OM 2009-11
Henize signed for PSG from Spanish club Valladolid at the same time as Ronaldinho came to the Parc des Princes. That meant his arrival went rather unnoticed — the Argentina international certainly made his presence felt after that in his three seasons with the Rouge-et-Bleu.
After playing centre-back alongside his idol, Mauricio Pochettino, Heinze was converted to left-back by Vahid Halilhodzic before heading to Manchester United in 2004 with a freshly acquired Coupe de France winner's medal.
Heinze described his stay at PSG as "the best three years of my career", which is saying something given he won the English Premier League with United and La Liga with Real Madrid before returning to France, and — in the eyes of PSG fans — did the unforgiveable.
"The PSG supporters will never understand, because it's difficult to understand," Heinze said after signing a three-year deal with OM in 2009.
He admitted he had hoped to return to PSG at the time, but a call from Didier Deschamps — then the OM coach — convinced him to move to the Stade Vélodrome where he won the Ligue 1 title in his maiden season, even scoring the only goal of that November's Classique to boot.
Claude Makelele OM 1997-98, PSG 2008-11
Makelele had over 160 Ligue 1 Uber Eats appearances under his belt with FC Nantes when he moved to Marseille in 1997, but only made a further 32 with OM before shipping off to Celta Vigo in Spain.
Following two Spanish titles and a UEFA Champions League with Real Madrid, and two English Premier League crowns at Chelsea, Makelele — hailed as a pioneering defensive midfielder — joined PSG in 2008.
He helped the club to the Coupe de France in 2009-10, and captained the side in the 2010-11 campaign, his last as a player before retiring at the age of 38.
He remained at the club, however, advising Leonardo in the Brazilian's first spell as sporting director and then becoming assistant coach to first-team bosses Carlo Ancelotti and then Laurent Blanc.
Lorik Cana PSG 2003-05, OM 2005-09
Cana did what few have managed (or even dared) to do successfully: go straight from one club to the other in this fierce rivalry.
Born in present-day Kosovo, Cana and his family fled to Switzerland before the Balkan war struck, and eight years later — in 2000 — he signed for PSG having convinced the club's then-reserve team coach, Antoine Kombouaré, of his qualities.
"Antoine was extraordinary with me," Cana later explained. "PSG were worried about my situation. For weeks, I was an illegal immigrant."
After Luis Fernandez brought him into the first team, the ex-Albania international's battling qualities and leadership skills made him an integral part of the side until — in the embryonic stages of the 2005-06 campaign — he found himself on the bench.
"In summer 2005, I felt I could take a step up with OM," Cana explained. "I wanted to win everything with Paris, but I felt that I wasn't going to be justly rewarded for the two seasons I'd just had. I was 22, I didn't want to go abroad, and in France — apart from PSG — I only saw myself at Marseille."
The qualities that made him a success in the capital worked too on the Mediterranean coast where the OM fans were quickly won over and Cana even captained the side in 2007.
He left in 2009 having twice finished Ligue 1 runner-up as an OM man — he also did so once at PSG — and with two Coupe de France runners-up medals, having been pipped to the prize in the 2005-06 competition by his former club.
