Shower Party is the 4th episode of season 2 of Uncle Grandpa, and the 56th episode overall of the series.
While Uncle Grandpa is in the shower, Andrew W.K. helps Pizza Steve and Mr. Gus throw a party.
Pizza Steve walks into the living room with no hope of going outside due to the weather and he gets bored, Mr. Gus suggests the idea to read a book but Pizza Steve has a better idea, to watch the music video channel on TV. When Pizza Steve turns on the TV it's on the rainy channel and he then notices it's on every other channel, Mr. Gus tells him that Uncle Grandpa changed the RV cable package and that the Rainy Network is the only channel they get now. Pizza Steve then screams in agony and tells Mr. Gus to call a cemetery because he'll die of boredom, some lightning hits the satellite dish and the TV turns to a party advertisement hosted by Andrew W.K., Mr. Gus stops Pizza Steve from calling Andrew because they can't throw a party when Uncle Grandpa is in the RV because of the last time when made a party fowl. Uncle Grandpa enters the room saying "Oh Yeah!" and informing the guys that he'll be taking his weekly 10 minute shower and he'll be completely out of their hair for the next 10 minutes, he then leaves to take his shower. Pizza Steve then calls Andrew's party hotline requesting a 10 minute party, Andrew then gives Pizza Steve a contract to sign, he signs, and Andrew says he'll be over there very shortly.
Andrew then smashes to RV door in and starts the party with a lot of punk people, Mr. Gus has a bad feeling that he's going to have a really good time, Andrew then proceeds to sing:
Lyrics: Andrew W.K: Ten minute Party! Ten minute party! We're going to have a party, It's a ten minute party!
Uncle Grandpa is in the shower and pulls out a checklist to see what he has to wash, he first washes behind his moustache with his nose. The party outside is continuing with Pizza Steve chugging smoothies, Mr. Gus lifting and throwing two guys into the air, some punk guy on the disco ball, Belly Bag trying to pick up some chicks (purses), Frankenstein riding Tiger with a random teenager, and then Andrew smashes the arcade game saying "Party tip #3: Everybody deserves to party!" and the videogame characters proceed to party along with Pizza Steve. Uncle Grandpa is in the shower with his surfing instructor Chad and thanks him for the lesson and to see him next week, Uncle Grandpa goes through the list to see what he has to do and the next thing he has to do is to wax his legs but he decides to do it later. In the party, everything is falling apart and Mr. Gus believes that the party has gotten out of hand but Pizza Steve says that those people look like they're partying responsibly and they break the rocking horse and more things break as the horse charges out of the RV. Mr. Gus then goes to talk to Andrew about the party and Andrew turns around with red stuff all over his face but it was just from the berry pie he was eating, Mr. Gus tells him that he has to stop the party but Andrew says that he only knows how to start a party and not stop one "Party tip #65" and proceeds to tell them that they still have plenty of time to party and he literally raises the roof of the RV.
Mr. Gus and Pizza Steve need an idea to stop the party and Mr. Gus says they only have 5 minutes left but Pizza Steve says the RV will be destroyed in 2 minutes, Andrew then releases some monkeys, the two then flashback to when they flashbacked about Uncle Grandpa's party fowl, they need to get Uncle Grandpa out of the shower to commit one of his party fowls. Uncle Grandpa is in the shower and now he has to wash his hare Alfonzo, and then he shampoos his eyes, Mr. Gus and Pizza Steve can't get into the bathroom until Andrew throws the sofa into the wall, Mr. Gus then tells Uncle Grandpa that he has to get out of there but he says he'll be out in 4 minutes, Pizza Steve flushes the toilet but that doesn't work, so Mr. Gus throws the bubble bath bottle into the shower and the RV overflows. Uncle Grandpa surfs out of the bathroom and in front of the party people, says "Good Morning!", and the shower curtain censoring him falls to the floor. Someone yelled "PARTY FOWL!" and everyone runs out of the RV. Andrew then says "Party tip #19: Never party in your birthday suit" and he dashes out of the window. Uncle Grandpa clears his eyes and sees the RV destroyed, Mr. Gus says that they can explain and the walls of the RV fall, lightning hits the satellite dish and it continues to rain, Uncle Grandpa says that they don't need to explain and he sees what's going on, he sees that the Rainy Network is on and he proceeds to watch the broken TV and laughs at it.
- In Andrew W K's party commercial, there was a reference to his previous show "Destory Build Destroy" where he uses an explosive to blow up a car.
- This is the 3rd episode to have a celebrity make a guest appearance on the show (Not including voice actors). The first two were Shaquille O'Neal in Perfect Kid, and Ric Flair in The History of Wrestling.
- When turned around and showing berry pie on his face, it referenced Andrew's major-label debut album "I Get Wet" with him on the cover with actual blood.
- Andrew singing about partying could reference a song he sang for the "Aqua Teen Hunger Force Colon Movie for Theaters" called "Party Party Party", though the song wasn't heard in the movie it's available on the movie's soundtrack. The song was first introduced in an "Aqua Teen Hunger Force" episode titled "Party All the Time" where Andrew W.K makes a guest appearance actually singing the song. The song has been heard in other various episodes.
- When Uncle Grandpa exits the elevator says "Oh Yeah!" three times that means the catchphrases like "Macho Man" Randy Savage.