Zimmerman Defense Begins Trial With "Knock-Knock" Joke
Description:First came an opening argument full or profanity from the prosecution. Then a knock-knock joke from the defense that didn’t evoke much of a response.
George Zimmerman said he was defending his life against 17-year-old Trayvon Martin when he shot and killed the unarmed teen in Sanford, Florida last year.
The prosecution said this 911 call said it all.
“Listen carefully when the screaming stops. It’s right when the gunshot goes off. Trayvon Martin was silenced immediately,” said John Guy.(2:45)