(YouTube.com)

Earlier today, there was a video on YouTube of Matt Damon freaking out on “Entourage” star Adrian Grenier. While many of us realized it was a goof, a few sites actually took the joke seriously. In fact, Blippitt wrote, “Looks like Matt Damon is the latest celebrity to have a ‘freak out’ caught on video.”

In the footage, Damon is directing a public service announcement on the set of “Entourage” for his charity OneXOne.org, but Grenier keeps messing up his lines. By Blippitt’s account, Damon “ends up flipping out on Adrian in front of everyone… Jeremy Piven is conveniently on-hand to try and keep the peace, but it doesn’t work.”

Blippitt then writes, “Some sources are claiming that this may have been faked, although we haven’t found any evidence to back that up.” What?!

OK, Gossip Cop can tell you that not only is that bit – which does promote his charity – on the show “Entourage,” but it’s also just the first part of a two-tiered gag.

Sorry, we’re not going to spoil that.