Jeffy's Cat Piano Problem! is the 332nd episode of SML Movies.
Jeffy gets his cat piano and starts singing a song about diarrhea however Mario doesn’t like it and takes Jeffy’s cat piano away. Mario grounds Jeffy and says he can’t get his cat piano back for a month. Jeffy has a temper tantrum and threw Junior's toy. Junior ask what's wrong and Jeffy said his dad took his Cat Piano so they went searching but they were unable to find it. Junior ask Jeffy to ask Mario for hint but Mario wouldn't give hints so Junior gave Jeffy a mini mushroom. He explains that he will become small using a mini mushroom and he would spitball him inside of Mario’s head. Junior then spitball him into Mario’s head. When Jeffy gets inside the head he starts controlling Mario to act like him. Mario tells Rosalina to call the cop and Rosalina questions what's wrong with Mario. Mario did ridiculous stuff that Jeffy does like cussing and hating green beans. He also dance the Hop Hop and yelled "Uh Uh" out loud. Then, Rosalina gives him green beans go eat. Mario was shown wearing a diaper. Mario then throws the green beans all over the table and asks for the cat piano. Mario then gets the cat piano and sneezes Jeffy out of his head. Mario recovers and doesn’t remember what happened. Mario saw Jeffy with the Cat Piano and yelled to give it back but Rosalina defends Jeffy by saying he can't take a trade back. Jeffy sings the diarrhea song and poops his pants and the video ends.
- This episode reveals that Mario's favorite vegetable is green beans which is probably the reason he makes Jeffy eat them.
- This episode also reveals that Jeffy broke his promise that he would eat his green beans. (Which is probably better if you ask me.)
- This episode is probably also Jeffy's act of payback on Mario for him trying to feed green beans to Jeffy in Jeffy and the Beanstalk!
- This episode is similar to the SpongeBob episode “Plankton” where one character goes in another’s brain and controlls the other person, or maybe Inside Out.
- The diarrhea song actually originates from Bob's Burgers.
- The Mini Mushroom from Shrek's Bath Problem! and Jeffy Gets Stung By a Bee! returns.
- The green bean joke returns after Jeffy promised to eat them in Jeffy and the Beanstalk!, However, it is possible that Jeffy controlled Mario, so he won't turn into a green bean.
- It's also possible that after this, Rosalina won't buy green beans anymore. Nor will Mario try and feed them to Jeffy.
- The plot was leaked in the Discord server when users Gensomura and NickPlayz showed screenshots of Chilly leaking the plot in Instagram private messages.
- Jeffy's thumbnail pose from Jeffy's Home Alone! is used in this video.
- This video reached at most, #10 on YouTube Trending.
- This is third time that Mario plays on Cat Piano.The first being Jeffy's Homework! and the second being Jeffy's Parents!
- It is unknown why we didn't see the emotions inside Mario's brain from Inside Jeffy.