A B767 FLT ATTENDANT RPTED TURB AFTER DEP FROM MIA CAUGHT THE CREW BY SURPRISE.

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SOMEONE CALLED BACK ON PHONE AND ADVISED ME THAT IT WOULD BE A LITTLE BUMPY AND IF IT GOT TOO BUMPY; TO BRING CARTS OUT OF AISLE TO GALLEY. THAT GOES WITHOUT SAYING. CREW WAS ACCOMPLISHING BEVERAGE SVC. AS GALLEY FLT ATTENDANT; I ADVISED CREW (ALL 4 WERE ON BEVERAGE CART) OF PHONE CALL. EVERYONE KEPT WORKING. SEATBELT SIGN HAD BEEN ON A WHILE AND WE HAD DONE A COMPLIANCE CHK ON PAX. ALL PAX WERE 'STRAPPED IN.' AS I WAS ABOUT TO REFILL A COFFEE POT; AFT GALLEY; THE ACFT JUST 'DROPPED.' I HIT MY HEAD ON CEILING. THIS CONTINUED FOR ABOUT 1 MIN. WE COULD NOT RELEASE OUR GRIP TO WHATEVER WE HAD FINALLY BEEN ABLE TO GRASP. I WAS ABLE TO FINALLY GET A HOLD OF THE 2 ASSIST HANDLES IN THE AFT PART OF GALLEY. NONE OF US WERE ABLE TO REACH OUR JUMPSEATS. I FELT LIKE A RAG DOLL BEING THROWN UP AND DOWN. I FELT HELPLESS. I SAW THE ASSIST HANDLES BUT I JUST COULDN'T GRASP THEM AT FIRST. IN THE CABIN; CART CANS FLEW UP. PAX GOT WET WITH COLD LIQUIDS BUT NO PAX WERE INJURED. CREW WAS NOT SEVERELY INJURED AND WE CHOSE TO CONTINUE WITH OUR PAX TO SFO; THEIR DEST. IN SFO; 3 CREW WENT TO EMER ROOM. IT HAD BEEN RAINING IN AND AROUND MIA AND IT TOOK US A WHILE TO TAXI AND CLB. CAPT HAD ASKED US TO STAY SEATED FOR A WHILE. CAPT SAID ON THE PA FROM THEN ON IT WAS 'CLR BLUE SKIES' AND WE COULD BEGIN SVC. 3 SUGGESTIONS: 1) IT IS IMPERATIVE THAT FLT ATTENDANTS DO A SEATBELT COMPLIANCE CHK ON PAX WHEN SEATBELT SIGN GOES ON. 2) MAYBE AIRLINES SHOULD LEAVE SEATBELT SIGN ON AT ALL TIMES AND ONLY MAKE ANNOUNCEMENTS ON PA WHEN IT IS IMPERATIVE THAT PAX NOT MOVE FROM THEIR SEATS. 3) PLTS SHOULD NEVER PROMISE 'CLR BLUE SKIES.'