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, since at the time of this episode's airing in 2002, digital ink was not very common and traditional cel animation wouldn't become defunct until two years later.[[note]]To say ''nothing'' about the shift to HD a few seasons later[[/note]]
* 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.
* DartboardOfHate: Sideshow Bob plays darts at Moe's, fashioning a likeness of Bart's face out of the darts.
* 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.
** Also a ContinuityNod; Bob has plenty of experience getting shot out of cannons, as revealed way back in "Krusty Gets Busted".
* {{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)".
* StunGuns: Wiggum affixes a remote button-controlled "shock garter" to Sideshow Bob's leg, which administers a jolt every time he threatens someone. Or whenever somebody feels like pushing the button.
* SuspiciouslySpecificDenial:
-->'''Chief Wiggum:''' Now, Mr. Simpson. Is it possible you're living a double or ''triple'' life that your wife doesn't know about?
-->'''Homer:''' Triple? ''[looks around]'' No. Definitely no.
* TakeThat:
** When Marge suggests the prison wasn't a good place to bring the kids, Lisa offers that it "still beats [[DisneyThemeParks Disney's California Adventure]]". The others quickly agree.
** While staying at the Simpsons' house, Bob watches an episode of ''[[Series/That80sShow That '30s Show]]'':
--->'''Sideshow Bob:''' Tom Shales gave this show a good review. And ''I'm'' the one in prison!
* TropeCoTropeOfTheWeek: Bob is housed at "Campbell's Chunky Soup Maximum Security Prison".
* UnusuallyUninterestingSight: Lampshaded, when various people show up to attack the "Homer" dummy Sideshow Bob rigs to lure the killer. Including Homer himself.
-->'''Homer:''' Once I kill you, everyone will think ''I'm'' the real Homer. Hahahahaha!
-->'''Sideshow Bob:''' ''[turning to the others]'' None of this seems odd to you?
-->'''Marge:''' ''[shrugging]'' Meh.
* WhyDontYouJustShootHim: At Moe's, the regulars mock Sideshow Bob's inability to kill Bart, with Lenny suggesting he "just come up behind him with a knife and slit his throat real quick-like".
** BrickJoke: At the end of the episode, confronting Bart in his room, Bob takes out a knife and says he's "going to take some advice that was given to me by Lenny, and kill you without delay". (Only to discover he can't go through with it, having grown accustomed to Bart's face.)
* YouKilledMyFather: The reason Frank Grimes, Jr. tries to kill Homer.