Over the years, we've seen plenty of fights on Keeping Up with the Kardashians.
Like, remember the time that Kendall and Kylie fought over a dress and then Kendall told one of Kylie's dogs "I'm sorry your mom is such a c--t"?
Or the time that Kourtney and Khloe were bickering and Kourtney dropped the epic line "F-ck you, you f-cking pregnant whore"?
Or, to take it way back, remember when Kim bought her very first Bentley and her siblings made fun of her for being so braggy about it?
(Naturally, she attacked Khloe with her purse.)
There's been quite a few classic feuds in this family, but what happened on last night's Keeping Up with the Kardashians premiere is definitely going to end up on the list, if not on top.
In the episode, Kim was seen doing the planning for the family's Christmas card photo shoot, which didn't go smoothly.
At one point she complained that she had to reschedule the shoot "so that we can all accomodate Miss Queen Kourtney."
But Kylie, who was very pregnant at the time, couldn't make it, and Kendall was busy, and Rob didn't want to be seen.
You know, standard.
"It's just like craziness," Kim explained. "So I thought, 'Why not show the craziness of our family?'"
She decided that they'd all do individual pictures to share throughout the month, and that's what ended up happening -- the edited together the final version with most of the family.
And although Kylie and Rob didn't do photos for the Christmas card at all, Kim went after her older sister with a vengeance.
"No one wants you in the f-cking shoot," she told her. "I'm planning it. I'm planning the shoot, so we don't want you in the shoot."
Kourtney replied that she'd already said she'd do the shoot as requested, but a fired-up Kim still wasn't having it.
"Maybe if you had a f-cking business that you were passionate about then you would know what it takes to run a f-cking business," Kim snapped.
"But you don't, so don't even act like you know what I'm talking about."
Kourtney didn't stick around to hear Kim's mouth any longer, so instead, Kim continued the chat with Khloe and Kris.
Telling them that Kourtney is "the least exciting to look at," Kim opined that she didn't have to be on the Christmas card.
"She doesn't do sh-t," she complained. "She doesn't know what it's like to actually have f-cking work to do."
And then, because that wasn't enough drama already, Kourtney called Khloe while she was still with Kim, and Khloe put her on speakerphone.
"I'm not here to f-cking be mistreated by my f-cking bitch family," Kourtney said through tears.
"Kim saying that I'm the least interesting to look at ... who even speaks like that?"
Kim didn't answer that question.
She did, however, stand her ground, telling her big sister "You do whatever the f-ck you want to do and you don't do sh-t. So be accommodating to the people that actually do sh-t."
And Kourtney delivered a line that will surely go down as one of the best in KUWTK history:
"You're a very distraught, evil human being ... I don't agree with who you are as a human being."
Later, Kim tried to make things right between them by inviting her to her baby shower for precious little Chicago, but Kourtney turned down her invitation.
After that, Kim said that she'd "really hoped Kourtney was gonna get over herself and just show up, but she didn't."
"So I don't think she's big on family 'cause if she was, she would be at my shower."
So it's clear that the feud is not over yet.
We're sure to see more sister fighting this season, but as a special treat, we saw quite a bit of it last night on Twitter as the episode aired!
Kourtney, Kim, and Khloe all tweeted during the show, and when her big fight with Kim started, Kourtney wrote "Watching this fight actually gives me chills."
"It's not normal to have to relive this stuff," she added.
Then she tweeted "We all have our own priorities. Mine is being a mother."
And Kim did not appreciate that one bit.
"And mine is not?" she asked. "The shoot was with our kids!!!!! My #1 priority is being a mother as well and I can work too, so can you!"
Kourtney told her that she does work, "But i wasn't wanting MORE work, i already felt spread thin. Being a good mother also has different meaning to each of us."
"You're an amazing mother," she added.
"I'm not taking that away from you."
But then Khloe jumped into her own argument with Kourtney ... or Kourtney dragged her in, rather.
Someone asked Khloe whose side she was on in the Christmas card feud, and she claimed that she "just wanted peace," to which Kourtney tweeted "Khloe let's be honest here."
"What the f-ck does that mean??" Khloe asked. "I didn't want peace??"
After stewing for a moment, she asked Kourtney if she was "for real," and she also asked "Do we want to get into why all of us were frustrated with you? You want to do this on twitter?"
"Please explain when I ever jumped in on that situation. I'm the one who f-cking called you to make sure you were good."
A little later, when Kourtney hadn't responded, Khloe tweeted her again and asked "Are you watching the same episode I am???"
"Do you think I was picking on you?"
"I was genuinely concerned about your happiness. Stop looping me into your drama with Kim! Don't ever tweet me that sh-t again!"
At one point during that absolute mess of an episode, Kourtney tweeted that she and her sisters are "ride or die."
At the same time, "I don't accept the way we criticize and judge each other anymore. My personal growth doesn't allow it."
Kim agreed, writing "Don't ever get it twisted, me, Kourtney and Khloe are GOOD! ALWAYS!!!! Never question that!"
But then Khloe said that "I was going to ask kourt to workout with me tomorrow but she may throw a dumbbell at my head lol."
So while they obviously still love each other, the fighting may still be happening.
Or, since pretty much all of these tweets ended with a "KUWTK" hashtag, there's also a very good chance that they're not fighting at all, they never really were, and Kris Jenner is just going hard for those ratings.
Guess we'll just have to wait until next week to figure it all out!