The double-wide stroller for twins WAS NOT not allowed on the plane.  It was tagged for gate check-in and the mother was told to leave it at the end of the jet way before boarding so it could be stored in the luggage compartment, which is normal procedure, but she instead tried to bring it on to the plane and was stopped from doing so by flight attendants.   She was wrong and the flight attendant who took the stroller from her was doing his job.  Shame on her and good for him.