witnesses in the courtroom this morning as the first full day of george zimmerman s defense case really got underway. and just like his mother and uncle s testimony last friday night, each witness today identifying zimmerman as the one screaming on that infamous 911 call. among witnesses taking the stand were friends of zimmerman and his wife and former co-workers of zimmerman. over and over again the jury listened to that neighbor s 911 call. i can t see him. i don t want to go out there, i don t know what s going on. [inaudible] there s screaming. do you know whose voice that is in the background screaming? yes, definitely. it s georgie. and how is it that you know that? i just hear, i hear it. i hear him screaming. reporter: with sandra osterman, prosecutors pointed out that she and her husband