hand grenade--self destructive stagehand, whose actions threaten all the people surrounding him or her. "When the deranged soundman started attacking the head that hired him, he became a hand grenade, whose actions threatened the jobs of the stagehands he was close with. Stay away from him."
ring around the Rosie--when stagehands have to move one or more pieces of furniture over and over, from place to place, because a designer is indecisive. A reference to the children's rhyme.
problem with his nose--specific substance abuse issue. "The head's son had a problem with his nose, so bad that he destroyed his good looks when his nose cartilage collapsed. He had what is called "a Coke nose."