If the "you break it, you buy it" rule applies at this duty-free shop ... these guys can expect a VERY hefty bill coming their way.
This insane video captures the mayhem at the Paris Orly Airport as 2 rival French rappers and their respective entourages went AT IT ... with punches, kicks and expensive cosmetics flying everywhere.
At one point, a man is pummeled by at least 3 other guys before they let up
The beefing rappers -- Booba and Kaaris -- were reportedly arrested along with 9 other members of their crews. It's unclear how much damage they caused, but by the looks of it ... they better hope they sell a lot of records after this.
The airport's terminal was briefly closed and some flights were delayed due to the melee.