When the feuding stars got together for the upcoming reunion, things got heated right away between Danielle Staub and Teresa Giudice, a source tells PEOPLE.
At one point host Andy Cohen and the ladies' costar Caroline Manzo had to intervene when Teresa got up out of her chair and started for Danielle, who was sitting across the room.
"You could feel the tension," the source says of the mood at the taping. "They were ready to go and they were ready to put it all out on the table."
And they did, according to the source, who described the early drama as "tame" compared to what happened later in the show.
"This might be the best reunion we've ever done," Cohen tells PEOPLE. "You won't believe how it starts and you won't believe how it ends."
The extended part one of the reunion airs Aug. 30 (10 p.m. ET) on Bravo, followed by an extended second part on Sept. 6 (9 p.m. ET). – Aaron Parsley