Video has emerged of two of reality television series Kitchen Nightmares' most notorious dropouts chasing a patron with what appears to be a large knife.

In the footage published by TMZ , Samy Bouzaglo – owner of Amy's Baking Company in Scottsdale, Arizona – tries to charge at a customer he allegedly chased into the street on Saturday shortly before 5pm.

His wife and business partner Amy stands in his way, pleading for him to "drop it" as he flails the knife-like object and yells obscenities.

The reportedly intoxicated man they are addressing is not shown.

"It's not worth it, you're going to go to jail for life. Think about what you're doing," a man behind the camera is overheard saying.

The couple achieved internet fame after they were filmed terrorizing customers and staff members on an episode of celebrity chef Gordon Ramsay's Kitchen Nightmares.

According to KTAR , the argument quickly escalated after Mrs Bouzaglo moved to kick the drunk patron out of the restaurant.

She later tried to convince TMZ that the object in Mr Bouzaglo's hand was a pen.

Witnesses told KTAR by the time police arrived, the man was gone.

No charges will be pressed unless he comes forward.