Someone's out to kill Homer, after Homer gets locked into a sauna by a hooded man and only Sideshow Bob can figure out who that is.

!! Tropes:
* ArtShift: As of this episode, the show fully switched over to digital paint. Like the previous two instances (Season 7's "Radioactive Man" and Season 12's "Tennis the Menace"), it wasn't well-received.[[note]]To say ''nothing'' about the shift to HD a few seasons later[[/note]]
* BrickJoke: At the bar, Moe and the other patrons mock Bob's inability to kill Bart, with Lenny saying that if it was him, he'd just "slash (Bart's) throat all quiet-like." At the end of the episode, attempting one more time to kill Bart, Bob takes out a knife and says that he's about to take "some very good advice that was given to me, by Lenny."
* CallBack: Most of Homer's past enemies were from previous episodes, including the son of deceased nuclear plant worker, Frank Grimes.
* ComicallyMissingThePoint: As Moe, Carl, and Lenny give Sideshow Bob advice on how to kill Bart, Homer shuts them up--not because they were threatening his son, but so Bob can think.
* DeadGuyJunior: Frank Grimes, Jr. is the person trying to kill Homer.
* ForeShadowing: There are various hints throughout the episode that indicate who's trying to kill Homer, as Sideshow Bob notices.
** When Bart examines the spa invitation sent to Homer by the killer, he discovers a black smudge on it.
** When the killer traps Homer in the sauna room, he uses an enormous wrench.
** When the killer tries to shoot Homer and escapes, he uses a tow truck.
* HumanCannonball: Bob gets into the cannon on one of the Mardi Gras floats and lights the fuse in order to launch himself into the air and save Homer from getting ImpaledWithExtremePrejudice on one of the swordfish in the swordfish museum.
* {{Jerkass}}: Homer's friends at the bar actually give Sideshow Bob advice and encouragement to kill Bart.
* RecruitingTheCriminal: In this case, Bob is the recruited criminal.
* SaunaOfDeath: First attempt on Homer's life. He was actually already in danger by being in the sauna at all because of his obesity and heart problems. The sauna controls helpfully included the setting [[InventionalWisdom "murder"]].
* SeriesContinuityError: This episode features the third different gravestone used for Frank Grimes. In "[[Recap/TheSimpsonsS8E23HomersEnemy Homer's Enemy]]", the gravestone simply read "Grimes", while "[[Recap/TheSimpsonsS11E14AloneAgainNaturaDiddily Alone Again, Natura-Diddily]]" read "Frank 'Grimey' Grimes". Here it reads "Frank Grimes (Homer's Enemy)".
* WhyDontYouJustShootHim: Sideshow Bob was asked why he doesn't just shoot Bart. He tried it at the end of the episode and it turns out he grew accustomed to Bart's face.
* YouKilledMyFather: The reason Frank Grimes, Jr. tries to kill Homer.