"You made it your life. You let it affect your life. You let it affect your whole life!" Ronnie fires at Mike. "You let it destroy your life. Bro, look at you! You f--king got a tax evasion! You almost lost everything you f--king earned."
"You put people's dirt out there," Ronnie says as he begins to lose his temper. "Your s--t is public! Your s--t is real news! That s--t is on the papers! That's why I talk about it. I don't bring your dirt in the house. I don't f--king sweep your name in the f--king mud. I just say what the facts are."
"You need help," Mike replies repeatedly.
"I don't have a problem, bro!" Ronnie fires back. "I help myself. You never help yourself. Lauren helps you now. I take care of Jen, I take care of my kid, and her f--king kid. Fact! End of the story. Bottom line. So don't ever f--king say I need help."
During a confessional, Pauly -- who spends most of the fight literally under the table in shock -- says, "Mike and Ronnie's dynamic is crazy. They have this history, and it's bad. It was only a matter of time before either Mike or Ronnie would lose their mind, and it is happening."
Jenni adds, "There's a lot of history between Ron and Mike, and they've been having this blow-for-blow, clap-back thing the whole vacation. We're a family, we're here, let's not leave with this bullshit still here. Let's air it out."
Watch the explosive argument on the "Jersey Shore: Family Vacation" finale, airing Thursday at 8 p.m. on MTV.