Greensboro, NC -- The first eyewitnesses in the George Zimmerman murder trial took the stand Wednesday, claiming Zimmerman was the aggressor in the murder of Trayvon Martin.
One of Martin's close friends said she was on the phone with him and heard the teenager scuffle with Zimmerman.
Two neighbors also took the stand, claiming they saw a larger man on top of a smaller man and heard screaming from a boy before they heard gunshots.
Zimmerman claims he acted in self-defense that night, while prosecutors hope to prove he profiled and murdered the black teenager.
Well, the famous electronic billboard on Battleground Avenue in Greensboro is joining the hotly debated topic.
It now reads, "Knock, Knock. Who's there? My new attorney that doesn't tell jokes in a murder trial." It's referencing how Zimmerman's attorney started the murder trial.
Billboard owner Marty Kotis says it's meant to get you talking about current events. The idea behind the PSA, or "public service amusement," is to display political or social commentary on the billboard, stirring up discussions.
Kotis says the topic changes each week, and the billboard has covered everything from our conflict with North Korea to entertainment news.
You might remember the same billboard for its mysterious messages about cheating in March.
Read More| Greensboro Billboard: Scorned Wife Or Publicity Stunt
Kotis later revealed that he was behind that billboard.
WFMY News 2