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Porky Pig purchases a new home from a real estate agent, which turns out to be a dilapidated old house. His cat Sylvester is horribly frightened of the creepy-looking place, but the clueless Porky finds it "quaint" and "peaceful", and looks forward to his first night in the place. Before long, Sylvester learns that the house is overrun with mice; killer mice, in fact (one wearing an executioner's hood and carrying an axe, the rest looking like the Chuck Jones-created characters Hubie and Bertie), who are just in the process of carting off the previous owners' cat (resembling a grey-furred version of Sylvester) to the chopping block.
Throughout the rest of the short, Sylvester is forced to dodge various knives, projectiles, trap doors, and other obstacles intended to kill him and his master. Porky, however, is completely unaware that anything is wrong, and is embarrassed that Sylvester is acting like such a coward. At one point, Porky was interrupted in his sleeping and said to Sylvester "Sylvester! I thought I told you to..." before his cat explains what went on downstairs but Porky said "What dishon...dishon... what ridiculous acting. Get out!" Sylvester points as if to say "Me?" "Yes, OUT!!" Unable to make Porky understand the house is haunted, Sylvester tries to shoot himself in the head, which alarms Porky, who tells Sylvester to "stop that, gimme that gu-gu-gu-pi-pistol!" - finally taking the gun after a short fight.
The mice have taken up primary residence inside the kitchen, where Sylvester does not dare to tread. Porky finds Sylvester fainted (after Sylvester got hit by a bowling ball which was landing on Porky himself), thinking that Sylvester was just trying to "work on his sympathies", and leaves him on the basket, but without notice, Sylvester has been lowered down into the mice's lair while in the basket and a while later comes up and Porky tells him to take off what Porky thought was make up, but the disguise was actually just Sylvester turning white from the aforementioned experience. Porky, sick and tired of Sylvester's foolishness, declares that "I'm going into that kitchen myself, and prove what a yellow dog of a cowardly cat you really are!" Sylvester feels humiliated and Porky goes into the kitchen. After a few seconds of silence, Sylvester peers into the kitchen. Sure enough, the mice have Porky bound, gagged, and on his way to be decapitated. Porky holds up a sign as the mice carry him away, which reads "YOU WERE RIGHT, SYLVESTER".
Sylvester, in fear, scrambles out of the house, not stopping until he is a good half-mile away. As he rests to catch his breath, his conscience appears and (via signs, not dialogue) cuts him to the quick, calling him a coward, reminding him of how Porky raised him from a kitten, showing him the "comparative sizes" of a cat to a mouse, and demanding that he get back in there and "FIGHT!" Suddenly bursting with courage, Sylvester grabs a tree branch for use as a weapon, and then changes his mind and taking the whole tree. Changed from the scaredy cat to a real hero, he races back into the mice-infested house, fights at full power and sends the hordes of murderous rodents running for their lives.
Having got rid of those mice, Porky graciously thanks Sylvester for saving his life, just as one leftover mouse (the executioner) pops out of the longcase clock and clobbers the cat with a mallet. The mouse yanks off his hood, revealing a Napoleon army hat, and declares (in a Lew Lehr voice and imitation), "Pussycats is the cwaziest peoples!" and chuckles.
- VHS - The Looney Tunes Video Show - Volume 3
- LaserDisc - Looney Tunes After Dark
- VHS - Looney Tunes: The Collectors Edition Volume 2 "Running Amuck"
- VHS - Porky Pig (1990)
- VHS - Special Bumper Collection (Vol. 4)
- DVD - Looney Tunes Golden Collection: Volume 1, Disc Two (1998 THIS VERSION, without dubbed notice, with original opening and credits)
- DVD - Saturday Morning Cartoons: 1960s Volume 2, Disc 1 (part of The Porky Pig Show, without the opening and closing titles)
- Blu-ray, DVD - Looney Tunes Platinum Collection: Volume 1, Disc One (remastered, with original opening and credits)
- In the USA, both Cartoon Network and Boomerang have aired two versions of this cartoon, each with violent parts edited:
- One version has the Blue Ribbon Merrie Melodies title card and cuts the scenes where Sylvester produces a pistol from a dresser drawer and threatens to kill himself if Porky does not let him stay to protect him from the mice and the scene where Porky bends over to pick up a scared Sylvester and nearly misses being shot by a mouse in a black hood. This was also how the scene was cut when aired on ABC (as part of The Bugs Bunny and Tweety Show) and the former WB! network.
- A rarely shown 1998 dubbed version, with the original opening and credits, which first aired on a 4:00am showing of the Cartoon Network compilation show Bugs and Daffy in 2003 and aired again on a New Year's Day marathon of Looney Tunes cartoons on January 1, 2010, has the original title cards and credits and reinstates the scene where Porky bends over to pick up a scared Sylvester and nearly misses getting shot by a mouse in a black hood, but still edits the scene where Sylvester withdraws a pistol from a drawer and threatens to kill himself with it and fights with Porky over the gun. In contrast to the usual "dissolve-edit" version that aired frequently on Cartoon Network, the new edited version cuts from Porky asking Sylvester to leave his bedroom to Sylvester crying and Porky chastising him for being a crybaby before relenting, and crops the shot of Porky chastising Sylvester for crying so the gun behind Porky's back is never shown. As of 2011, this new edited version is the version that used to air on Cartoon Network and now airs on Boomerang.[citation needed|date=]
- At one point Porky says he should have gotten a dog. This is in stark contrast to several other Porky cartoons directed by Chuck Jones, where Charlie Dog tries to get himself adopted by Porky, who says he doesn't want a dog. As this short was released after "Little Orphan Airedale", this could be Porky saying he regrets not adopting Charlie.
- This is the first cartoon where Sylvester is given his name, as prior to that he was unnamed (or in the case of "Tweetie Pie" he was named "Thomas"). This is also the first Sylvester cartoon directed by Chuck Jones.
- This was only one of five post-1948 WB cartoons to get a Blue Ribbon reissue prior to 1956 - with the original credits cut. The others were "Daffy Dilly", "The Foghorn Leghorn", "Kit for Cat", and "You Were Never Duckier". "Scaredy Cat" is the latest-released cartoon to have its credits cut upon reissue.
- It was the first of three Jones cartoons which placed Porky Pig and Sylvester (in a rare non-speaking role as Porky's pet) in a spooky setting where only Sylvester was aware of the danger, the other two films being "Claws for Alarm" (1954) and "Jumpin' Jupiter" (1955).
- This was the only entry in the trilogy in which Porky Pig does eventually realize the danger they are in.
- Parts of this cartoon were used in the Halloween TV special, Bugs Bunny's Howl-oween Special.
- In this short, there is a brief sequence where Sylvester is reminded by his conscience of how Porky raised him from a kitten. Sylvester's kitten form in this sequence possibly inspired the creation of his son Sylvester Junior in the Robert McKimson cartoons.
- The high-pitched yelling from the fleeing mice was re-used in "Kiss Me Cat" (when the mice family runs away from a "magnified" Pussyfoot) and "Forward March Hare" (when the soldiers run for cover as Bugs uses an ammunition shell to nail his calendar to a wall). Interestingly the former cartoon also depicts the cats as the heroes and the mice as the villains rather than vice-versa, much like this cartoon. Both were also directed by Jones.