A B777 FLT ATTENDANT IN CHARGE RPTED THAT ONE OF HER FLT ATTENDANTS WAS ACCOSTED BY AN ANGRY PAX WHO DEMANDED; BUT DID NOT RECEIVE; EXTRA SVC DURING A FLT FROM EGLL TO ORD.

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FLT ATTENDANT #7 CAME TO FIRST CLASS TO TELL ME THAT PAX IN BUSINESS CLASS HAD GRABBED HER ARM AND REPEATEDLY THRUST HER OPENED PALM OF HER HAND INTO FLT ATTENDANT #7'S FACE DUE TO THE FACT THAT FLT ATTENDANT #7 HAD TOLD HER THAT SHE HAD NO EXTRA BUTTER TO GIVE TO HER DAUGHTER. I WENT BACK AND INFORMED PAX THAT SHE WAS NOT TO TOUCH ANY MEMBER OF MY CREW AT WHICH TIME PAX THRUST THE PALM OF HER HAND AT MY FACE. I REPEATED 2 MORE TIMES IN A LOUD; STERN VOICE THAT SHE WAS NOT TO TOUCH ANY MEMBER OF MY CREW FOR ANY REASON; WHATSOEVER. SHE CALMED DOWN AND ASKED ME TO LISTEN TO HER. SHE TRIED TO TURN IT AROUND AND ACCUSED FLT ATTENDANT #7 OF GRABBING HER. PAX SITTING BEHIND PROB PAX WAS SHAKING HIS HEAD 'NO' AND POINTING AT PAX; MEANING 'SHE DID IT.' I APOLOGIZED TO PAX THAT; INDEED; WE HAD NO EXTRA BUTTER AND INFORMED HER THAT IF THIS CONTINUED; I WOULD HAVE TO HAVE ANOTHER FLT ATTENDANT SERVE HER. NO FURTHER INCIDENT ON BOARD. ON THE GND; I LOOKED AT PAX'S PNR AND SAW IN THE RECORD THAT SHE HAD BEEN VERBALLY ABUSING A RESERVATION AGENT. HER HUSBAND AND DAUGHTER WERE TRAVELING WITH HER UNDER DIFFERENT NAMES. IN HUSBAND'S RECORD; IT ALSO NOTED ABRUPT CONVERSATION WITH RESERVATION AGENT INVOLVING AN UPGRADE.