Joe and Niggy Marino used to box the cards -- fix the deck -- or they'd play partners, and kick each other to signal for discards: five kicks meant to throw the five, two for the deuce, etc.
CNN: Excerpt: 'Joe DiMaggio: The Hero's Life'
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When the trucks geared down for the hill in North Beach, Niggy would climb on the back, or he'd get Frank Venezia to run the truck down (Frank could run like a deer), and they'd throw grapes off to everybody else.