Surprising Opening Arguments at the George Zimmerman Trial We begin with the fireworks in a florida courtroom, the case that has triggered so much passionate debate, the trayvon martin trial has now begun. George zimmerman accused of murder. Today both sides came out swinging with profanity and punchlines. And abc's matt gutman was there. Reporter: Tonight these jarring words. punks, these , they always get away. Reporter: The words uttered to the call to the police dispatcher. Those were the words in that grown man's mouth as he followed in the dark, a 17-year-old boy, who he didn't know. Reporter: The proggedz tugging at the heart strings of the six-person jury, all women. He did not shoot trayvon martin because he had to, he shot him for the worst of all reasons, because he wanted to. Reporter: The defense, also trying to draw in those six women with a joke. Knock knock. Who's there? George zimmerman. George zimmerman who? All right, good. You're on the jury. A joke in reference to the difficulty in finding an unbiased juror in this case, but not a single juror laughed. Look closely, even the lead prosecutor mystified. Zimmerman told investigators he first spotted the 17-year-old walking through his development, then he says he lost sight of the team. We now know he seemed to look for him and encurrent him in this area. Zimmerman a day later reen acted what happened. A life and death struggle playing out in this 911 tape. George zimmerman was crying out for help and no one helped. Reporter: As the 911 tape was played in court, trayvon mart martin's mother who says it's her son screaming, left the court visibly shaking. Thank you so much, matt. And this trial, by the way is expected to last about four weeks.