If you saw the new clip of Saw IV (Clip Named: Autopsy) they show Tobin Bell's penis. It's kinda blurry but you can still make it out.
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Clip Link: http://www.fearnet.com/Video.aspx?mid=59248e2c-822e-4f55-b4bc-c8ec70e3cb19
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Clip Link: http://www.fearnet.com/Video.aspx?mid=59248e2c-822e-4f55-b4bc-c8ec70e3cb19