A B737 FLC; WHILE AT THE GATE IN ORD; WERE INFORMED BY THE FLT ATTENDANTS THAT 2 PAX; IN SPITE OF BEING TOLD BY THE #1 FLT ATTENDANT TO CALM DOWN; REFUSED TO DO SO. THE CAPT HAD THEM REMOVED FROM THE ACFT!

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A YOUNG MAN DURING BOARDING JUMPED FROM ROW X TO HIS SEAT Y (1 ROW DISTANCE). BEING IN THE AFT GALLEY; I FELT THE PLANE SHAKE AND ROW Y ROCK OUT OF ITS BRACKETS. THE YOUNG MAN APPEARED TO BE HYPER AND KIND OF CRAZED. HIS FRIEND FROM SEAT U MOVED TO SIT NEXT TO HIS FRIEND IN ROW Y. THE 2 GUYS STARTED SHOUTING; CURSING; USING PROFANITIES. THEY ALSO STARTED PUNCHING AND SLAPPING EACH OTHER. THE FEMALE PAX IN ROW X HAD HER SEATBACK BEING KICKED BY THEM AND SHE KEPT LOOKING AT ME TO SEE WHAT I WOULD AND COULD DO TO STOP IT. OTHER PAX; HEARING THE SHOUTED CURSES; KEPT LOOKING AT ME TO SEE WHAT I WOULD DO. FLT ATTENDANT #4; AFTER PULLING TICKETS; COULD SEE THE GUY'S ARMS FLAILING AROUND AND COULD HEAR THE SHOUTS FROM THE EMER WINDOW EXITS. SHE AND I DECIDED THAT THE GUYS WOULD ONLY CONTINUE THE ROUGHHOUSE AND SWEAR ONCE WE GOT IN THE AIR; SO WE CALLED THE #1 FLT ATTENDANT AND THE CAPT. THE #1 FLT ATTENDANT CAME BACK AND ASKED THE YOUNG MEN IF THEY WOULD CALM DOWN. THE YOUNG MEN DIDN'T RESPOND TO HIM; SO THE CAPT AGREED WITH ALL THE FLT ATTENDANTS AND HAD THE YOUNG MEN REMOVED FROM THE ACFT. THE CREW'S PLAN WAS TO TAKE ACTION ON THE GND; SO THE ROUGHHOUSING AND PROFANITY THAT WOULD ESCALATE IN THE AIR WOULD BE TAKEN CARE OF BEFORE TKOF.