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George Zimmerman's Lawyer Opens Murder Trial Defense With A Knock-Knock Joke

  • U.S.
  • 06.26.13 04:04 PM EDT
Today is the first day of George Zimmerman's trial for the murder of Trayvon Martin. Martin, an unarmed 17-year old, was shot and killed last year. Zimmerman, 29, claims he shot Martin in self-defense. George West, Zimmerman's attorney, opened the defense... by telling a knock-knock joke.