The traditional THWACK! of Hollywood fight scenes sounds like anything but flesh and bone being pounded by flesh and bone. Easily the most disturbing quality of David Fincher's 1999 masterpiece Fight Club is the sound design: every time someone gets hit or thrown to the ground, you feel it. You cringe. It hurts you in the same place they were hit on the screen. Film Radar discovers the ingredients for realistic fight sounds — chicken carcasses, walnuts, celery, and plastic wrap, with a side of punching each other in the chest.