Put your fingertips on his fingertips and then squeeze his fist making it get tighter and tighter... while you're going the wrong way with them, you'll find somebody really wants to open their hand when the pressure comes. If they really resist, go to just one finger and squeeze it. Trust me, they will want to open their hand... It really doesn't matter which finger you squeeze, it'll work fine on any of them...

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What man is a man that does not make the world a better place?... from "Kingdom of Heaven"