ACR MLG CREW LANDS ACFT AFTER THEY RECEIVE A HOSTESS CALL BELL AT 50 FT AGL.

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LNDG SFO IN VMC ON VISUAL APCH RWY 28R. ALSO HAD CO- PARALLEL TURBOPROP LNDG RWY 28L ABEAM. ALL TFC WAS SIGHTED AND IDENTED; NORMAL APCH ON THE 'QUIET BRIDGE; RWY 28R VISUAL; SFO.' ALL CREW FUNCTIONS COMPLETED; IN STERILE COCKPIT AND FLT ATTENDANTS HAD ACCOMPLISHED LNDG CABIN CHKS AND WERE IN JUMPSEATS STRAPPED IN. AT 50 FT OR LESS AGL IN THE FLARE; COCKPIT ATTENDANT CALLING CHIME WENT OFF. BOTH PLTS WERE OUTSIDE FOR THE TOUCHDOWN; SO WE COMPLETED LNDG. (OFTEN FLT ATTENDANTS HIT WRONG CALL BUTTON WHEN CALLING EACH OTHER AT THEIR JUMPSEATS). ON ROLLOUT WE HAD A COMMUTER CAPT IN JUMPSEAT; AND I ASKED HIM TO CHK ON CALL VIA HANDSET BY THROTTLE (HE WAS NON- REVENUE; NON-DUTY). HE INFORMED ME A PAX WAS IN THE LAVATORY. WE COMPLETED LNDG BRAKING SOFTLY; CLRED RWY AND STOPPED. I TOOK HANDSET TO INQUIRE ABOUT PAX. APPARENTLY ON VERY SHORT FINAL A MIDDLE-AGE FEMALE STOOD AND RACED TO THE AFT LAV. SHE WAS TOLD TO SIT BUT SAID 'NO; I HAVE TO GO.' THE FLT ATTENDANT THEN CALLED US AS WE WERE TOUCHING DOWN. I ASKED THEM TO GET HER NAME AND ADVISE WHEN SHE'S SEATED. WE THEN PROCEEDED TO GATE. I PULLED PAX ASIDE; SHE WAS NOW VERY SHAKEN SINCE WE'D ASKED HER NAME; AND COUNSELED HER ON THE LAW; SAFETY; AND HER RECKLESSNESS. SHE WAS VERY APOLOGETIC; STATED SHE DIDN'T KNOW WE WERE THAT CLOSE TO THE GND. I REITERATED THE LAW AND CONCERN FOR HER SAFETY. SHE THEN DEPLANED. THIS WAS A VERY EXPERIENCED CABIN CREW. IN RETROSPECT; GIVEN THE SIT; SHORT OF TACKLING THIS PAX AND COMPROMISING THEIR OWN SAFETY; THERE WAS NOTHING THE FLT ATTENDANTS COULD DO. AS FAR AS COCKPIT; WE ARE TRAINED TO IGNORE THIS TYPE OF DISTR WHEN LNDG AND FLY THE AIRPLANE.