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David Hyde Pierce flew into a rage and refused to speak a line that belittled his character's beloved flame Daphne! "Niles would NEVER say something like that," snapped David, who ranted and raved for 20 minutes. When producers put their foot down, the star exploded, flung his script on the floor and stormed off! Kelsey Grammer played peacemaker, saying quietly: "It's a small thing . . . let's just keep the peace." Producers caved, changed the line -- and Kelsey coaxed his buddy back from Sulk City!