CABIN ATTENDANT RPT; B777; NRT-SEA. PAX SMOKING IN LAVATORY DIDN'T PUT CIGARETTE OUT; WOULD NOT EXIT LAVATORY. CAPT AND CABIN ATTENDANT TOOK DOOR OFF HINGES. PAX WAS DRINKING FROM OWN BOTTLE. RETURN TO NRT; PAX REMOVED.

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THE LAVATORY SMOKING DETECTOR WENT OFF AT LAVATORY 3L. I MANUALLY UNLOCKED THE DOOR AND WENT INSIDE; FINDING A PAX SMOKING. I TOLD HIM TO PUT IT OUT AND GIVE ME THE CIGARETTE. HE PUT THE SMOKING CIGARETTE IN HIS L PANT'S POCKET; AND STILL REFUSED TO GIVE ME THE LIT CIGARETTE AND LEAVE THE LAVATORY. I WALKED OUT OF THE LAVATORY TO GET ASSISTANCE. HE THEN CLOSED THE LAVATORY DOOR AND KEPT HIS HAND ON THE LOCK SO THAT I COULDN'T UNLOCK THE DOOR. WE CALLED THE PURSER AND THE CAPT. THE CAPT CAME TO LAVATORY 3L; BUT COULD NOT GET HIM OUT. I USED A LEATHERMAN TOOL TO TAKE OFF THE DOOR. HE CAME OUT OF THE LAVATORY; AND WE RETURNED TO NRT TO HAVE HIM DEPLANED. THE PAX CONTINUED TO NOT UNDERSTAND EITHER ENGLISH OR JAPANESE (ALTHOUGH HE WAS A JAPANESE NATIONAL). HE RETURNED TO HIS SEAT AND REMAINED QUIET. I FOUND AT HIS SEAT A BOTTLE GLEN FIDDISH SCOTCH; WHICH WAS 3/4 EMPTY. I GAVE THIS TO THE PURSER TO KEEP AS EVIDENCE OF HIM DRINKING. OTHER PAX NEARBY SAID 'HE WAS OCCASIONALLY DRINKING FROM THE BOTTLE AND TALKING NONSENSE TO HIMSELF. OBVIOUSLY; HE WAS VERY UNSTABLE.