Another cell-phone atrocity: The New York Post’s Page Six reports that at Prince’s exclusive rooftop concert, held this weekend at New York’s Gansevoort Hotel, crowd members insisted on leaving their cell phones powered up. This despite warnings that phones were wrecking the singer’s sound system. "It was so obnoxious," a bystander tells the paper. "To think a bunch of idiots can't exist without their precious cells for an hour." Guests included Spike Lee and Anderson Cooper. And speaking of strangeness, Prince insisted on having a humidifier in every room of his suite.