“Right," I said. My ears were still ringing slightly. "Did you just wake me with a policemen's rattle? You can hear those things from two blocks away." "A what? No, this is a grogger--it's an old Judaic instrument. It's used during Purim to make a deafening racket during special readings. Charming, isn't it? Marvelously raucous custom." "Knocking gently also works." "You have no appreciation for culture.”
Book:Beastly Bones