Credit: Peter Kramer/Bravo Photo: Rosie Pierri and Kathy Wakile Pose With Andy Cohen

As the first installment of a three-part Season 4 reunion concluded on The Real Housewives of New Jersey tonight, things got very ugly over on Teresa Giudice's family couch. In fact, the situation got so heated between Tre and her cousin Kathy Wakile that Teresa preferred to sit next to Caroline Manzo.

The fight started off between the cousins bashing each other's husbands (newsflash, ladies, neither one of them is great), but Kathy really escalated the debate when she called Teresa's mother a liar for saying that she and Richie were getting divorced. Just in case that didn't push her buttons enough, Kathy went on to call Tre’s father a coward.

Clearly outraged with crazy eyes in full effect, Teresa claimed that her dad was there for Kathy more than her own father. It was at this point that a voice began booming through the Borgata Hotel Casino & Spa. 

From backstage, Kathy's sister, Rosie, started yelling that she was going to rip Teresa's effing head off ... and that she meant it. She didn't care if she got locked up, she would cut Teresa's tongue out if she mentioned her further.

Next week should be interesting.

Were you shocked at Rosie’s threat on the Season 4 reunion? Weigh in below!