Marge Simpson, Patty Bouvier, and Selma Bouvier
Mr. Burns, Ned Flanders, Principal Skinner, Waylon Smithers, Kent Brockman, and others
Homer Simpson, Grampa Simpson, Barney Gumble, Krusty the Clown, Groundskeeper Willie, and others
Bart Simpson, Nelson Muntz, Ralph Wiggum, Todd Flanders, and others
Apu Nahasapeemapetilon, Moe Szyslak, Chief Wiggum, Comic Book Guy, Lou, and others
Milhouse Van Houten, Rod Flanders, Jimbo Jones, and others
Agnes Skinner, Brandine Del Roy, Dolph and others
Frink Jr doesn't speak at all, he just mimics his father.
Coltrane has a cardboard tombstone.
Bart: (After his bike is ran over by Dr. Hibbert) My bike! My crappy, crappy bike!
Dolph: (After being mooned by Bart, while on his bike) No one does this to Dolph. NO ONE!!!
Announcer: If robots can feel pain then we are horrible, horrible people.
Lisa: Mum, I'm not sure I'm ready for a new cat.
Marge: (looking through a book) 'When Bad Things Happen to Cute Children' says that a new pet will pull you out of your sorrow cycle.
Lisa: That book doesn't know how I feel!
Marge: Oh, it's very wise. It's written by a Rabbi… who surfs!
Homer: Robot, I command you: do something cool!
(Robot throws it's head at Homer, then falls apart)
Bart: (reading a note from Homer) Dear Bart. If this robot doesn't prove I love you, then you can both go to hell.
Marge: (after Lisa said a prayer for Coltrane) And Lord, if you think I'm making lemon bars for your bake sale, Sunday, you'd better stop killing our cats!
Lisa: Mum, I'm not sure God responds to threats and intimidation.
Marge: It's the only way to talk to bullies.
Homer: Son, did you ever suspect it was me?
Bart: Well, you did disappear a lot but I've gone whole summers without seeing you.
Homer: Heh heh heh… yeah, I'm pretty unreliable.
Sideshow Mel: That robot has given birth to a man!
Bart: Then Knock-A-Homer did three victory laps and pretended to drink a beer.
Homer: He-he-he, pretended.
Lisa: Dad, what are all those cuts?
Homer: Various bug bites and wounds now stop interrupting your brother.
Lisa: Well, I think it's only fair I get to name him. You got to name me.
Marge: You should be glad I did. Your father wanted to call you Bartzena.
Homer: I'll assemble it myself!
Bart: Dad, no! Think of the bike!
Homer: I can make a bike! I made you!
Bart: Yeah, great workmanship (dislocates his arm)
Homer: Hey, that's gonna win you a lot of bar-bets some day.
Homer: Son would you like to ride your new bike out of the store?
Bart: Can I? For true?
Homer: For true, son!
Homer: Wait a minute, what is it my dad always said to me?
Grandpa: (appearing in a speech bubble) If you can't build a robot, be a robot!
Homer: That's it!
(while building Bart a bike)
Homer: Man, this is so confusing! (holding up a tire) What the hell is this?
Bart: Okay, I've been studying Frinks' robot and I've discovered he has one small weak spot. (sees Frinks' robot getting a spike plate installed) Uh-oh, his weak spot is now his strongest point.
Homer: (inside the robot) OOOOHHHHHH!!!
Bart: That moan sounded almost human…
Homer: (from inside the robot) THE HELL IT DID!!
Homer (building the robot): I could quit now, but then my son never would look up to me. Oooh, why was I born a dad?
Homer: (the robot hands Homer a drink) He knows just how I like my martinis; full of alcohol.
Homer: (is injured in the Robot ring) Ha ho! Doing it for the boy. Doing it for the boy. Pain is love. To bleed is to care!
Nelson: HA HA! Your dad's not handy!
Marge: Aww sweetie, when I was your age I lost my guinea pig, Cinnamon, and I thought the pain would never - ahhh! (crying) Cinnamon! It should have been me who chewed through that extension cord!
Homer: A 10-speed bike? What did your mother say?
Bart: She said yes.
Marge (yelling from the kitchen): I said no!
Homer: I'm confused, which is it?
Marge: It's no! His old bike is fine!
Homer: Yeah, the kitchen lady is right, your old bike still works.
Ned: That is one bitchin' bike.
Rod: Daddy said a cuss word!
Ned: Lighten up, Roddy.
Moe: (in the 'Robot Rumble' audience) Aww geez, I'm the only one in the audience over fifteen.
Teenager: Are you here with your children sir?
Moe: Uh, yeah, my two kids. (raises his fists) Screw and You.
Lisa: I'm keeping you! You're Snowball 5, but to save money on a new dish, we'll just call you Snowball II and pretend this whole thing never happened.
Principal Skinner: That's really a cheat, isn't it?
Lisa: I guess you're right, Principal Tanzarian.
Principal Skinner: I'll just be moving along, Lisa. Snowball II.
Announcer 1: He's killing him softly with his saw!
Announcer 2: Killing him softly?
Announcer 1: With his saw!
Bart: I'm riding a unicycle with my pants down… this should be every boys' dream!
Homer: Bart, all that button ever did was send a mild electric shock up my backside.
Bart: Why did you make it do that?
Homer: To keep me focused.
Jessica Lovejoy makes a cameo appearance in this episode, her first appearance on the show in nearly 10 years.
This is Homer's third failed attempt at making a robot (i.e., "Homer the Moe" and mentioned in "Itchy and Scratchy Land").
Skinner's real last name is Tamzarian. Just want to point out if no one knows yet...Skinner is Armenian.
3rd appearance of the crazy cat lady.
Coltrane has a hairdo similar to Bart Simpson.
Prof. Frink's son was first seen in "Brother Can You Spare Two Dimes".
Lisa violates the law declared at the end of "The Principal and The Pauper" stating that no one was to refer to Skinner being a fake.
Snowball II dies and is eventually replaced by Snowball V. Snowball V just happens to look exactly like Snowball II, and Lisa rationalizes calling the new cat Snowball II and pretending the whole thing never happened. This is a classic device that the Simpsons uses whenever a normal episode (non-Halloween), does something that changes the show in a significant but unpopular way (in fact she makes reference to Skinner being fake).
The "Annoyed Grunt" in the title translates to "D'oh".
Blackboard Joke: None.
Couch Gag: In the living room the couch is replaced by a giant cake. A pair of hands comes down with a cake decorating tube and begins to use it to decorate the top of the cake with the various family members.
Bart: This butt's for you.
Bart spoofs the classic Budweiser advertisement slogan, "This Bud's for you," when he moons Jimbo, Dolph and Kearney on his bike and utters the aforementioned line.
In the commercial featuring Killhammad Aieee, he's fighting a robot identical to the one at the end of the 1984 film "The Terminator."
Homer and Bart watch videotapes of fighting robots, one of which is labeled "KillHammed Aii vs. Circuit Ray Leonard." This is a play on the names of boxers Muhammad Ali and Sugar Ray Leonard.
As Lisa is about to adopt Coltrane, she says she likes him because of his name and later asks if he would like to listen to something by his namesake. We know Lisa likes jazz music, so the name of the cat is a reference to John Coltrane (1926-1967) who was an American jazz saxophonist and composer.
The Jetson's episode "One Strike You´re Out" has a similar subplot: George accidentally breaks a robot that Elroy built for a school marathon, and disguises himself as the robot.
A deeply-saddened Lisa (along with the rest of her family) dress up in their Sunday best to pay Snowball II – and his hapless successors – their final respects, much like the Huxtables did in The Cosby Show episode, "Goodbye, Mr. Fish."
Grandpa Simpson: If you cant build a robot, be a robot.
In the "Steel" episode of The Twilight Zone robots box each other instead of people. When the robot breaks down and can't be fixed, the lead character pretends to be a robot (and is beaten badly) just like Homer.
The song playing during the montage of robot fights is called "Watching Scotty Grow" by Bobby Goldsboro. It was also played during the soapbox construction montage of the episode "Saturdays of Thunder."
The title of the episode is a reference to the classic Isaac Asimov novel I, Robot. In this book, the three important rules that should govern robot behavior are introduced.
Here are, paraphrased for the convenience of "today's busy idiot," Issac Asimov's Three Laws for Robots:
Robots may not kill or injure human directly or through an action.
Robots will obey commands given by humans except orders to kill or injure other humans.
Robots must protect themselves to exist unless it harms humans and defies orders given by humans.
Snowball: The multiple cat deaths
This is most likely a homage to the 1990 comedy film "Madhouse", where the family cat died multiple times. Snowball III drowns in aquarium, like in the movie.
Chief Knock-A-Homer's name may be inspired from the former mascot of the Atlanta Braves called Chief Noc-a-Homa.
Professor Frink and his son's robot looks similar to the ED-209 robot from the 1987 film RoboCop.
The robot battle shows "Robot Wars" and "Battlebots" are sources of inspiration for "Robot Rumble."
ringside announcers: "Killing him softly. " "With his saw."
A reference to the song "Killing Me Softly (With His Song)". A very big song for Roberta Flack in 1973 that has also been recorded by a number of other artists.
Announcer: Smashius Clay a.k.a. KIllHammed Ali!
Professor Frink's robot is named after the famous boxer, Muhammad Ali, whose real name was Cassius Clay.
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