Narrative:

After pushback and upon engine start-up; 3 passenger seated separately got up out of their seats to go to 3 separate bathrooms. The aft flight attendants were concerned by this unusual behavior; did a safety sweep of the bathrooms involved; and the pilot and I were notified of their concerns. The captain said that 'they' were going to 'run' the names of the passenger of concern prior to takeoff; but would continue to taxi to the runway while awaiting feedback. The aft flight attendants asked me to come to the back and 'check out' the passenger of concern; and I did so. Upon getting back to the aircraft and obtaining the seat numbers from the other flight attendants; the aircraft made a sharp turn and started rolling down the runway. No announcement was made to 'prepare for takeoff' from the cockpit prior to takeoff. I was able to quickly situation in an empty passenger seat at approximately row 31 of the right aisle. As soon as it was safe for me to be up; I returned to my jumpseat and after sterile cockpit was complete; I informed the captain what had occurred and he apologized for not informing the cabin crew to prepare for takeoff prior to doing so.

Google
 

Original NASA ASRS Text

Title: 3 PAX SIMULTANEOUSLY HEADING FOR THE RESTROOM DURING TAXI RESULT IN SECURITY CONCERNS AND A TKOF WITH CABIN ATTENDANTS OUT OF THEIR ASSIGNED SEATS.

Narrative: AFTER PUSHBACK AND UPON ENG START-UP; 3 PAX SEATED SEPARATELY GOT UP OUT OF THEIR SEATS TO GO TO 3 SEPARATE BATHROOMS. THE AFT FLT ATTENDANTS WERE CONCERNED BY THIS UNUSUAL BEHAVIOR; DID A SAFETY SWEEP OF THE BATHROOMS INVOLVED; AND THE PLT AND I WERE NOTIFIED OF THEIR CONCERNS. THE CAPT SAID THAT 'THEY' WERE GOING TO 'RUN' THE NAMES OF THE PAX OF CONCERN PRIOR TO TKOF; BUT WOULD CONTINUE TO TAXI TO THE RWY WHILE AWAITING FEEDBACK. THE AFT FLT ATTENDANTS ASKED ME TO COME TO THE BACK AND 'CHK OUT' THE PAX OF CONCERN; AND I DID SO. UPON GETTING BACK TO THE ACFT AND OBTAINING THE SEAT NUMBERS FROM THE OTHER FLT ATTENDANTS; THE ACFT MADE A SHARP TURN AND STARTED ROLLING DOWN THE RWY. NO ANNOUNCEMENT WAS MADE TO 'PREPARE FOR TKOF' FROM THE COCKPIT PRIOR TO TKOF. I WAS ABLE TO QUICKLY SIT IN AN EMPTY PAX SEAT AT APPROX ROW 31 OF THE R AISLE. AS SOON AS IT WAS SAFE FOR ME TO BE UP; I RETURNED TO MY JUMPSEAT AND AFTER STERILE COCKPIT WAS COMPLETE; I INFORMED THE CAPT WHAT HAD OCCURRED AND HE APOLOGIZED FOR NOT INFORMING THE CABIN CREW TO PREPARE FOR TKOF PRIOR TO DOING SO.

Data retrieved from NASA's ASRS site as of January 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.