Turns out it was a crappy idea. The principal of a Hell’s Kitchen HS that used to be among the most violent in the city had students using wooden toilet plungers as hall passes this school year. The half-baked scheme by the second-year principal at the HS of Graphic Communication Arts that placed 2-foot-long plungers in every classroom last month immediately plunged the school into chaos, a source said. “The kids were using the plungers to whack each other, to pop ceiling tiles in the bathroom,” the source said. “They were sticking it in the toilet and then flinging them...