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Yeah he did... That was crazy, but there had to be a mirror or something in the fish tank. ... How the hell, did they disappear a cow!!!

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I’m pretty sure that wasn’t a cow at all, just a balloon. The “trunk” and “ears” moved moved because Penn and Teller touched them. None of the circle of crowd members standing around on the stage ever touched the “cow”. P&T planted the idea it was a cow by showing a video of a cow moving around, but the one on the stage never actually moved.