When everyone in the park, including Hi-Five Ghost, have prior plans and are unable to go celebrate Muscle Man's fifth anniversary working at the park, Muscle Man impulsively signs on to become a gut model for a magazine for pregnant women to get revenge by making them feel bad. Unfortunately for him, everyone is supportive of his decision and don't make any effort trying to get him not to take the job, making Muscle Man think that don't care about him and then finds that his new job isn't as fun as he thought.
Tropes in this episode include:
- A Day in the Limelight: Muscle Man is the main focus of this episode instead of Mordecai and Rigby.
- An Aesop: Just because your loved ones or friends refuse to or are unable to do things with you, doesn't mean that they don't love you for who you are.
- Blob Monster: As a result of Muscle Man's erratic behavior, he accidentally created a shapeless monster composed entirely of grease hellbent on a rampage.
- Body Horror: Muscle Man gets burnt to a crisp after trying to fight the grease monster to save his friends.
- Create Your Own Villain: Muscle Man throws a hissy fit at his party and starts throwing a bunch of random shit into the deep fryers from the restaurant catering his goodbye party, despite the protests of one of the employees. This leads to the creation of a giant monster made of living grease.
- Deep-Fried Whatever: The restaurant where Muscle Man celebrates his anniversary, "Fry It Up", specializes in this, having things like fried chicken wings, muffin tops, a cream cheese donut stuffed inside a roast chicken, and fried milk as some of the many entrees they serve. Later in the episode, Muscle Man goes berserk and starts frying a microphone along with its stand, a chair, plastic utensils, and then he gets fried after trying to fight the monster created from all the things he dumped in the fryers.
- Deflector Shields: When the aforementioned grease monster starts destroying everything, Hi-Five Ghost turns into a bubble to shield Muscle Man from a glob of sheering, hot grease thrown from the monster.
- Didn't Think This Through: Muscle Man accepts the gut model job to make everyone feel bad for not going to his anniversary party. However, when he announces that he's quitting, everyone is supportive of his new job and raise no opposition, Hi-Five Ghost is paired up with Mordecai and Rigby since Muscle Man's (seemingly) not working in the park anymore, and when Muscle Man keeps the charade going, hoping that everyone is either pretending that he's really quitting or that they'll beg him to stay, he ends up obliviously signing a contract that makes him a gut model for life, which sucks because the guys who hired him only care about having a superficial, business relationship with him, in contrast to the camaraderie the park employees have, not even bothering to high-five with Muscle Man, laugh at his "my mom" jokes, or call him by his nickname, instead referring to him by his real name, Mitch.
- Entitled Bastard: Muscle Man is genuinely surprised when everyone is too busy to show up at his celebration, throwing a childish fit in the process. He also expects his friends to pity him when he's "leaving" the park for a new career. When they don't, he doesn't take it very well, to say the least.
- Gone Horribly Right: At the end, Muscle Man finds out that even though everyone was acting happy for him leaving the park for the gut model job, they were secretly upset that he was leaving and just wanted to be good friends by supporting him and his new career; this is revealed after Muscle Man had accidently created a grease monster that's endangering everyone at his party by messing around with the deep fryers out of rage.
- Innocently Insensitive: The park employees being supportive of Muscle Man's gut model job is viewed by Muscle Man as them not caring about him leaving the park.
- It's All About Me: Muscle Man is so selfish and unreasonable when everyone is unable to go to his party, he creates a convoluted plot to make them feel bad and beg him to stay at the park, which involves signing up for a high paying, but crappy career that he almost gets stuck working in forever.
- I Want My Beloved to Be Happy: A platonic example. The park employees reveal that even though they acted supportive of Muscle Man's new job, they felt devastated that he was leaving and didn't intervene or tried to stop him from quitting because they wanted him to be happy.
- Laser-Guided Karma: While you're inclined to feel sorry for Muscle Man for him thinking that nobody cares about him and for almost getting stuck in a job he doesn't really like for the rest of his life, the guy brought all this stuff upon himself for being a selfish drama queen and making stupid decisions all just to get back at those he thought "betrayed" him.
- The Main Characters Do Everything: Subverted when it comes to the climax. Turns out, a sentient blob of deep fry oil which can fry any living thing that touches it is a bit out of the main character's skillset; when Muscle Man tried, he got severely burned. It falls to firefighters to try and neutralize the monster, and even then it's clearly going to take a while.
- Manchild: Muscle Man throwing a fit when everyone can't come to his anniversary party due to making other plans is not unlike a little kid getting upset because his friends can't come to his birthday party.
- Never My Fault: Muscle Man gets angry at his friends for "ditching" him at his celebration, ignoring that it was actually the bad timing on his part that made it unable to work out.
- Poor Communication Kills: The plot as a whole would've never happened if everyone was aware of each other's weekend plans (whether it be the park crew's fault for forgetting Muscle Man's anniversary or Muscle Man's fault for making plans at the last second) and if Muscle Man talked it out with the park employees about how to hurt he was for them missing out on his party, instead of bottling up his feelings until he couldn't keep his rage in anymore.
- Pre Ass Kicking One Liner: Muscle Man as he fights the grease monster.Muscle Man: Yo, grease puddle! You wanna fry something? Fry this!
- Roaring Rampage of Revenge: When nobody does or says anything to try to stop Muscle Man stay from taking the gut model job before he ignorantly signs a contract that forces him to be a gut model for life, he goes ballistic and starts wrecking the party, inadvertently creating a monster in the process.Muscle Man: YEAH! FRY IT UP EVERYONE! FRY UP EVERYTHING!!
- Senseless Sacrifice: Zig-zagged; Muscle Man attacks the grease monster to try and save everyone, emphasis on "try", because he ends up severely burnt, covered in grease crust, and in serious pain, while the monster is still alive and being attacked by firefighters trying to kill it by covering it with a breadcrumb mixture. However, Mordecai points out that attacking the monster allowed everyone to escape, so Muscle Man's sacrifice wasn't in vain. Plus, it allows Muscle Man to escape his life long contract as a gut model due to his injuries.
- Shout-Out:
- To the Leslie Gore song, "It's My Party":"Fry It Up" Employee: Stop! You can't put inedible items in the fryer!
Muscle Man: It's my party and I'll fry if I want to! - The ending of this episode references the ending of Lethal Weapon 2:(The guys laugh as Filbert & Mulligan walk off)
Muscle Man: Can you guys stop making me laugh? It hurts when I smile.
(The guys laugh again)
Muscle Man: (laughs, then groans in pain)
- To the Leslie Gore song, "It's My Party":
- Status Quo Is God: At the end of everything, Muscle Man ends up staying in the park.
- A Tragedy of Impulsiveness: The episode's conflict gets worse when Muscle Man keeps making stupid decisions like signing up for the gut model job to get everyone upset, continuing the scheme despite nobody getting upset at him leaving like he wanted, and then throwing a tantrum at his going away party and dumping a bunch of crap in the deep fryers, accidently creating a monster that nearly kills him and everyone attending the party, including his friends.
- What the Hell, Hero?: When Muscle Man reveals his true motives for accepting the gut model job after the creation of the grease monster, Hi-Five Ghost chews him out for getting so worked up:Hi-Five Ghost: Dude, that was just bad timing! Get over it! If you left, it wouldn't be the same.
