Raw video: Attorney tells 'knock knock' joke in George Zimmerman trial opening statement

Raw video: Attorney tells 'knock knock' joke in George Zimmerman trial opening statement

Raw video: Attorney tells 'knock knock' joke in George Zimmerman trial opening statement

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Raw video: Attorney tells 'knock knock' joke in George Zimmerman trial opening statement

Raw video: Attorney tells 'knock knock' joke in George Zimmerman trial opening statement
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