"Dee absolutely hasn't changed," Kaitlin Olson says of her character Dee "Sweet Dee" Reynolds on It's Always Sunny In Philadelphia, the cult-loved FXX show which bows its 11th season tonight. "That's kind of the goal for us, to make sure these characters age, but don't ever grow or change," she continues. "That's why we brought in Danny DeVito as a parent character [in season two], so we can see that this is where they're going to end up. As they get older, they'll be the same people who never learn a lesson. I love the idea that absolutely no growth has happened in these characters."

Olson, who stars on the series alongside a "gang" that includes real-life husband Rob McElhenney (Mac), Charlie Day (Charlie), Glenn Howerton (Dennis), and DeVito (Frank), has loved (almost) every minute of making the intentionally-offensive comedy. For her, the strength of the series is in its unusual tone: "The comedy is unexpected," she says. "You never can really predict where the episode will go. That's my sense of humor. I like to be a little surprised."

In honor of the show's new season, we asked Olson to discuss 10 of Sweet Dee's most hilarious (and certainly surprising) episodic moments. They are both funny and horrifying, which is exactly what we'd expected from It's Always Sunny:

"Dennis and Dee Go on Welfare," S2, Ep. 3

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"This has been a real longterm favorite," Olson says of the episode in which Dee and her twin brother Dennis get addicted to crack in order to qualify for welfare. "That was so much fun to shoot. Any time Glenn and I can play drunk or on drugs together it's fantastic. Singing [Biz] on the steps in Philadelphia was awesome. I remember it was hot and locals were gathered around watching. That was a really fun moment. The episode really showed us that Dee is extremely gullible, that she knows nothing, that she is susceptible to bad behavior, and that she'll follow Dennis anywhere—even though she can't stand him."

"Hundred Dollar Baby," S2, Ep. 5

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An early episode sees Frank training Dee to be a fighter, much like in Million Dollar Baby. Unlike in that film, though, Dee gets hopped up on steroids and ends up screaming a now-infamous line at her rival: "I will eat your babies, bitch!" It's one of Olson's favorite Dee moments. "Any time I can have a rage outburst I'm in heaven," she says. "I think it's so much fun. As far as I remember, 'I will eat your babies, bitch' was just something Rob came up with in between takes as we were shooting it, which I thought was so funny. We have these great scripts, but there's always a chance to make things funnier when you're shooting it. People constantly shout that line at me. Somebody yelled it at me when I was with my kid once and I thought it was hilarious. Luckily he was young enough not to know what was going on."

"Dee Reynolds: Shaping America's Youth," S6, Ep. 9

"I like the episodes where Dee gets vulnerable enough–or ridiculous enough–to think she can act and really believes it," Olson says of the episode where Dee becomes a (terrible) high school theater teacher. "It shows what her goals are outside of the bar, which you don't get to see very often. She's usually just competing with the rest of the gang. But it's fun to see any of the characters do something that's just for themselves. It's way funnier when Dee fails, too."

"Sweet Dee Has a Heart Attack," S4, Ep. 10

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"Any time the guys don't care when Dee gets hurt is funny to me," Olson says of this episode in which Dee's heart attack inspires the gang to get aggressively healthy. In classic form, Dee tells a spin instructor, "Maybe you shouldn't dress like a bumblebee, bitch." Says Olson: "That was another thing that happened on the day we were shooting. I love those lines that just pop up. 'Bitch' gets thrown around a lot."

"The Gang Goes to the Jersey Shore," S7, Ep. 2

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In season seven, the gang memorably heads to the Jersey Shore, where Dee has her hair put in braids, one of which gets ripped off during a roller coaster. "They should shut down that ride—or people should stop getting cornrows," Olson says. "That was very freeing to have my hair like that though. This was like, 'Alright, well, I look ridiculous, but nobody has to come do any hair touchups on me all day.'"

"The Gang Broke Dee," S9, Ep. 1

Dee's standup career finally took off in a recent episode–only to be thwarted by the gang in a really malicious way. "I did not see this coming," Olson says. "Rob purposefully leaves out some storylines when they're writing so I can read them for the first time when I get the scripts. I was laughing so hard by the end. It's so mean. I can't think of anything in world meaner than that, and sadly that's amazing to me." Olson also loves playing Dee when she looks terrible: "It's the best," she says. "It's way less stress. I can get ready in five minutes. And also playing her as ugly and gross–you don't get to do that very often and it's way more fun. It takes the pressure off. She's definitely the anti-sitcom female, which is really appealing to me."

"The Gang Buys a Boat," S6, Ep. 3

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Dee's best moment (arguably) is a scene in which she dances by mimicking the movements of an inflatable man. And it's a lasting visual that continues to inspire fans: "I love how much people have responded to that episode," Olson says. "I get tweets every single day about it. I love it so much because I worked so hard mimicking that thing. And I was six months pregnant and trying to hide it. It was 3 a.m. out on a boat in Long Beach. It was freezing cold, and I was so tired. I remember being so angry that because I was pregnant I couldn't bend backwards as far as I wanted. I just kept trying harder and harder and that stupid baby wouldn't let me do it. I'm pretty sure I ripped my stomach muscle moving like that. That's what I can thank for ruining my stomach. But I worked so so hard on that dance and I think it ended up looking fantastic."

"The Gang Reignites the Rivalry," S5, Ep. 12

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In this episode, Dee and the gang challenge a fraternity to a flip cup tournament. "Poor Dee," Olson says. "I love so much when they all gang up on her. I love that she wants to prove to them–and specifically to Dennis–that she's good enough. She would never admit that, but it's clearly what's going on, and it's just so desperate and so sad."

"Mac and Dennis Break Up," S5, Ep. 9

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During the fifth season Dee gets a cat, who promptly gets lodged in the wall of her apartment. Despite many insane efforts, no one is able to get him out–and Dee herself ends up caught inside the wall. "It's so ridiculous," Olson says. "The idea that we kept putting more and more things in the wall to get the cat is so dumb. The reason I love that kind of thing is that you get to see these characters scheme in so many different ways." She hopes it isn't too relatable, though: "I hope no one has gotten their cat stuck in the wall," the actress adds. "And if so, I'm sorry."

"The Gang Solves the Gas Crisis," S4, Ep. 2

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One of Dee's funniest moments also happened to be Olson's most painful: Frank interrogates Dee in the bar bathroom. "There have been times on the show where I have been literally in so much pain I can't believe I stuck through with it," Olson says. "That waterboarding scene? They did not do a great job of that. They put wetsuit material over my face thinking that would block it, but I got waterboarded! I had recently broken my back so I was laying on a broken back, inverted, being waterboarded. I was like, 'I'm a team player, but I can only hang in there a few more minutes.'"

Emily Zemler Emily Zemler is a freelance writer based in London.

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