George Zimmerman's defense attorneys said in opening statements that the neighborhood watch volunteer fatally shot Trayvon Martin in self-defense, playing 911 calls made by Zimmerman, himself, and other witnesses on the night of the shooting.
Defense attorney Don West told jurors Monday that Zimmerman was being viciously attacked when he shot the 17-year-old Miami-area teen.
West began his opening statement by acknowledging that Martin's death was a tragedy, and that his parents have every right to feel the way they feel.
West also tried to ligthen the mood by telling the jurors a joke: "Knock, knock. / Who's there? / George Zimmerman. / George Zimmerman who? / All right, good. You're on the jury."
That knock-knock joke quickly made the rounds on social media, with many reactions from people on both sides of the case.
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