‘Kitchen Nightmares’ Star — Threatens to Kill Restaurant Patron … WITH A KNIFE

EXCLUSIVE

Amy’s Baking Company founder Samy Bouzaglo — who appeared on “Kitchen Nightmares” — attacked someone with a knife further than his restaurant Saturday … and the footage is CRAZY!

The person who shot the video says a drunk guy was eating at the Scottsdale restaurant when Samy’s wife Amy Bouzaglo became enraged and ordered him to leave — and he did.

But Samy wasn’t done with…