When they're all at each other's throats in "Battle of the Bands", except Carl, who's just yelling "DRUM SOLOOOO" over and over again in a bad Liverpudlian accent.
The opening of "Lady Sings the News" has Jimmy switching the images of the local news anchor's and weather-girl's heads with those of Sheen and Carl, respectively. Carl discovers what happens on the screen when he spins around in Jimmy's room...
Carl-head-on-weathergirl: Come on, Anchorman! Spin your head with me!
After Jimmy admits he's been using advanced bats and mitts he gives his team a Rousing Speech saying they can win without them, and the match still ends with them having gotten 0 runs.
At the end they go see a Godzillaexpy, and when Sheen sees that it's laughably small it breathes fire in his face. He then asks Jimmy if he knows the Japanese word for "ambulance".
The entirety of "Grumpy Young Men", though some highlights include:
Sheen staring at the standee for an M-rated game in an attempt to spite the cashier after he throws the trio out, after which the cashier throws an ice cream cone at him.
Goddard's reaction to seeing Old!Jimmy, which is to let out a stock horror movie scream.
Old!Sheen complaining about how kids today wear their pants.
Old!Jimmy being carried across the street against his will.
Even Cindy and Libby were impressed with Hugh's determination to get Old!Jimmy across the street.
Old!Jimmy convincing Old!Carl and Sheen to step through the Chronotron with offers of prune whip on the other side, followed by them trying to squeeze through and Goddard pushing them through the gate with seconds to spare.
Carl eating Jimmy's bowl of experimental truth serum and promptly spouting out deranged secrets, including liking Jimmy's mom and not really believing in Ultra Lord.
Sheen: (covering his ears) LALALALA LALALA!
"And the gold under our lawn to use in case Dad decides to give all our money to telemarketers! ...Again."
The Nanobot duo are very amusing. Some of their highlights in their episodes...
Nanobot 01: (knocks on Jimmy's door to the lab) Telegram.
Carl: Like I'm gonna fall for that.
Nanobot 02: Llamagram.
Carl: Llamagram?! Oh boy! (opens the door... gets deleted)
"And we want our cookie back!" (pulls out a plunger)
After the Nanobots first get into the saucer transport:
Nanobot 01: (Sees Nanobot 02 glaring at him) What?
Nanobot 02: Your chair is bigger than mine.
The above becomes a brick joke later on once the Nanobots enter their saucer in another episode:
Nanobot 02: I call captain's chair!
Nanobot 01: Over my dead relays! (Beats up 02, throws him into other chair)
In "Sorry, Wrong Era," Carl begins dancing calypso and Jimmy stares in shock before briefly giving an Aside Glance to the viewers.
In "The Tomorrow Boys", heavy metal rock band Graystar is about to play at Retroville. Upon the future Cop-Bot seeing them:
Cop-Bot: Graystar! My favorite classic oldies band!
Sheen: How can I watch my eyes dissolve? Carl: No Sheen, you're supposed to watch your eyes before they're dissolved. Sheen: "Watch my eyes?" It doesn't make any sense. Jimmy: Guys, please!
People complaining to Judy about Hugh using the time gizmo on them.
Sam: He disgusted all my customers, yeah!
Libby: He gave us brain freeze!
Woman: He made me experience the miracle of birth again and again and again...(sobs)
Sam: Yeah, birth.
Macbeth in Space, all of it.
Hugh's imitation of Gollum from "Lights, Camera, Danger!".
In the same episode, when Sheen sends his script in.
Sheen: I just taped pieces of the phone book together. I call it Attack of the People Named Frank Johnson!
Also, Jimmy going though a bunch of old movie clips for inspiration for his script. After we hear "Gotta blast!" in the montage, Jimmy gives a sly smile and Aside Glance to the camera.
Carl accidentally summoning Attila the Hun from the past, and sending him back to impress his Swedish pen-pal in Carl Wheezer, Boy Genius.
Carl:(Panicking) Who wants fudge brownies!?
Attila:(Stops breaking things) Plain or with nuts?
Carl:(Nervously bites into a brownie) N-nuts.
Attila: NUTS!? AHAHAHAHAHA! (Chases brownies back into time vortex)
This troper thinks that Sheen coming back to the electrical shock-inducing doorknob in "Krunch Time" was hilarious.
Party At Neutron's is full of moments like this.
Jimmy: Right this way, ladies.
Cindy: Ah-ah-ah, can it, Neutron. We're only here to make caddy observations and rude remarks.
Libby:And there was nothing good on TV.
Sheen: We could play Spin The Bottle...*spins bottle with a seductive look at Libby*
Libby: Yeaaah, *stops bottle* or we could play, "Spin Sheen and Him With A Bottle!"
Jimmy: Well, Mom didn't say anything about Sheen inviting anyone over, so okay! Sheen, uh, I guess it'd be OK if you invited just a few...
Sheen: Could you keep it down, Jimmy? (Into two phones) Yeah, you heard me! Party at Neutron's! Call everyone you ever met in your entire life and tell them to get over here right now!
"Um, honey, how long have we had a dinosaur in the closet?"
In Ultra Sheen, Jimmy tells Sheen and Carl to head over to his lab with their favorite video games. Sheen is there the very next second.
Jimmy: Hey, how'd you get here so quick?
Sheen: I already had a copy of, "Ultra Lord vs. Robo-Fiend: Mega Battle'' in my pocket!
Jimmy: And you carry that around all the time...?
Sheen: Maybe. I can quit whenever I want to. I DON'T HAVE A PROBLEM!!!
Jimmy: Not today you don't.
"That's going to leave an ultra-bruise!" (dies)
The Idea Bulb that comes from Jimmy's mind, which Doc promptly grabs because he needs to change a light bulb in the teacher's lounge.
"Jimmy For President" has Mrs. Fowl listing off the transgressions of the candidates as bribery, blackmail & MURDER!, causing all the students in the auditorium chairs to scream in horror. Mrs. Fowl corrects herself, stating that the last one wasn't murder, but piloting a blimp on school property without a permit.
Sheen's attempt to read hieroglyphics. It starts off fairly convincing, shocking the others, then quickly dissolves into hilarious nonsense.