Anything and everything that Dr. Weird ever says or does, but the moment most would nominate for the top spot is when he announces "GENTLEMEN, BEHOLD... CORN!"
It manages to be just as hilarious the second time, too;
Dr. Weird: GENTLEMEN! I BRING YOU... [shutter opens up] MORE CORN! Steve: Uh, gee, I dunno... I mean, after last time— Dr. Weird: THIS TIME SHALL BE DIFFERENT! [cackles] Steve: Well, alright... I am getting hungry again— [corn launches at him and pins him to the wall] Dr. Weird: IT'S NOT DIFFERENT AT ALL, IS IT, STEVE? AAAHAHAHAHAHA!
The second appearance of the Mooninites:
Dr. Weird: Gentleman... BEHOLD! [shutter opens, revealing a wall of amps] Are you ready to ROCK? (awkward silence) Steve: Y-yeah, I'm ready to ro— Dr. Weird: THEN I'M GONNA BLOW YOUR HAIR TO THE BACK OF THIS AUDITORIUM! 1, 2, 3, 4! [starts shredding] THIS ONE IS CALLED "ROBOT AFFLICTION"!
Dr. Weird: *A snake is coiled around his neck* Steve...
Dr. Weird: You got that stick? Slowly... and carefully now... AGITATE THE HELL OUT OF THIS SNAKE!
Steve: Oh hell no!
Dr. Weird: HAHAHAHAHA! GENTLEMEN! BEHOLD! [doors open, Moth-Monster-man is revealed...] Moth-Monst-[and flies out through the rabbit hole] OH NO! MOTHMONSTERMAN NO! COME BACK! Steve: He has escaped! Dr. Weird: Yes. Through the hole! [slips and falls] MY BANANA!
The entire live action episode is comic gold. There's something about seeing Meatwad as a faceless inanimate exercise ball that's really funny for some reason.
When the Plutonians begin their prank war with the Mooninites:
Oglethorpe: Oh no, he did not do that! That dude back there just flipped me off! [Back at the Mooninites' ship, Ignigknot is flashing an extra-large middle finger.] Err: Did he see it? Ignigknot: Oh yes he did. Oglethorpe: Stop the ship! Emory: Okay, but we're not supposed to stop it at this speed... Oglethorpe: STOP IT AT THIS SPEED! [The ship comes to an abrupt halt, and they both crash through the window.] Err: Oh man, that was so—oh man, he's backin' up!(beep)IN FLY' HE'S BACKIN' UP! COME ON! Ignigknot: No. (flashes a second extra-large middle finger) We'll double his pleasure. Err: Take TWO, muddamuchacos! Ignigknot: And call us in the morning. Err: Yeah, call us! We'll be drunk!
Ignigknot doing roll call at the meeting for all the villains seen so far:
Ignigknot: Romulox...? Romulox: Here I am, rock you like a hurricane. Ignigknot: Happy Time Harry...? [Happy Time Harry vomits.] Ignigknot: Cybernetic Ghost of Christmas Past from the Future...? Cybernetic Ghost: [as smoke blows around him]Thousands of years ago, before Sigourney Weaver— Ignigknot: Just-just "here" will do fine. Cybernetic Ghost: ...Here. Err: And NO SMOKING! [jumping up and down in place] GIMME A SMOKE, GIMME A SMOKE, GIMME A SMOKE! Ignigknot: Err, control yourself. Stick to the patch. Err: [to the Ghost] And you! Tell another story! Cybernetic Ghost: [as smoke blows around him]Thousands of years ago... Err: (breathing in) Mmmm... smooth and menthol-y. Ignigknot: Emory and Oglethorpe...? [awkward silence] Err: Ha-HA! Ignigknot: "...were not invited" is the correct end to that sentence. Err: Put a period on that! Ignigknot Plutonians are teh sucknote This is how the closed captioning reads for this statement.
Dr. Weird interrupting the shot of South Jersey Island by popping in front of the screen and shouting "BULL SH[bleep]!"
With Shake, Frylock and Meatwad out of their home, a handful of sirens move in. Two beautiful women... and John Kruk. (Which is even funnier not because he was on the '93 NL champion Phillies, but because he's a local demigod in the South Jersey/Philadelphia area). His attempts at "singing" are one of the funniest things seen on ATHF.
John Kruk: [Moves toward Carl] ...That kinda means they don't like it, Carl.
At the end of one episode, Frylock buys a new television after spending the whole episode talking about how TV is bad for you, resulting in this gem.
Meatward: I thought you said TV was bad.
Frylock: Oh it is... but we f*** ing need it!
The end of "Dumber Days" when Meatwad is brought down to normal... while he was in the middle of giving out "Flying Car Rides" (with Carl's car), making the car land on Carl's roof.
Carl: [sarcastic laughter] Oh, do not tell me THAT IS MY CAR UP THERE ON THE ROOF! Meatwad: ...okay, we won't. Carl: Get it down— Meatwad: Okay. Carl: Wait, don't get it down—[Carl's car lands with a loud crash, totaled in the process] DAMN IT!
Pretty much the entirety of "Super Spore".
When Meatwad gets into the medicine cabinet in the "Robositter" episode. Not only does he turn into a flower and speak like some kind of guru, but when Meatwad's trip goes bad... well, his image of Frylock is something that must be seen to be believed.
In the episode where Meatwad gets the ability to see the future, he has a vision in which Frylock walks out the door and suddenly explodes. Frylock decides to go outside to prove Meatwad wrong. Cue an explosion from outside. Frylock suddenly comes back in and says, in a perfectly deadpan voice:
"The... dog blew up again."
The entirety of "Multiple Meat".
Especially "3 Million Bottles of Beer on the Wall":
Meatwad #17: Wait, I got mixed up. Start over!
And when they finally finish the song after 27 years:
Meatwad #1: Hehehe, that was fun! Meatwad #2: Yep, that was fun! Meatwad #3: That was fun. Meatwad #4: Well now what do we do? Meatwad #1: I suppose we can sit here and get to know each other. Or we could sing that song one more cotton-picking time!
The ending of "Juggalo" with the court scene, particularly the Insane Clown Posse saying they work for the community and that they spit fire.
"Global Grilling". Shake buys a new barbecue grill—the Char-Nobyl 6000. It uses radioactive material to cook, and even on Super-Low it's enough to cause a global environmental disaster (it's not even supposed to be in the country; even Carl's shoulder hair and the clouds catch fire). The next day, the grill has scorched the entire neighborhood. Meatwad throws a pan out the front door, which promptly explodes.
Master Shake goes completely Drunk with Power when he steals Frylock's contact lenses in "Laser Lenses". A list of grievances include:
Repeatedly mouthing off to (and then blasting) Carl.
Forcing Carl to order him Chinese take-out, and then blasting him when he whimsically changes his order.
And in the process burned down his house and scorched his lawn into a charred wreck.
Terry's "cosmetic surgery" at the end of the episode (to replace Frylock's bad surgery, he ends up giving him eye-tits).
This exchange between Dr. Weird and Steve:
Steve: [enter] Hey, I'm back from lunch— Dr. Weird: WHERE'S MINE?! [Beat] Steve: Um... I thought you said you didn't eat, because, uh... [Dr. Weird rips his brain out from the back of his head] ...because it makes you crazy? Dr. Weird: THIS MAKES ME CRAZY! [collapses, dies; brain starts floating around] Dr. Weird's Brain: Gimme some fries, boy! [Dr. Weird's brain chases Steve, shooting lasers at him]
Dr. Weird: YES, TERRY! MINE FOR BRAINS! UWAHAHAHAHAHA! Steve: Hey, uh... who was that on the phone? Dr. Weird: Um, no one... er—HEY! LET'S [produces massive needle]HIGHLIGHT YOUR HAIR! Steve: But I like my hair this color— [Steve gets jabbed in the neck with the needle and immediately collapses] Dr. Weird: IT BEGINS!
Steve: [talking on a phone] Uh, yeah. Uh, six inch on wheat, no mayo... uh, hang on. Uh, Dr. Weird? Dr. Weird: [with his hand behind his back] MY ASS HAS FINALLY DECIDED TO EAT MY HAND! (sharp convulsion) IT HUNGERS... FOR MORE! [Dr. Weird's entire body gets sucked in until there's nothing left but a small ball of flesh with a piece of Dr. Weird's muumuu sticking out.] Steve: [completely unfazed] Uh, yeah; just the one hoagie.
LOOK AT THIS UNIT! [strips, revealing a body you would find on a Ken doll]
"Yeah, I wrote that. It's called 'I Wanna Rock Your Body'... and then in parentheses it says 'To The Break Of Dawn'."
A whole lot from "Cybernetic Ghost of Christmas Past from the Future":
Child-Carl's Christmas gift. Which is a piece of carpet. Which is also his dinner.
That Carl's house was built upon elfin graves, hence why his pool was filled with elfin blood.
The look on Shake's face when he sees Carl's head attached to the body of an old black guy.
The Mooninites' completely opposing reactions to seeing Frylock's Eye Beams for the first time.
Ignignokt: What was that?
Err: Did those just come out of your eyes?
Ignignokt: They're primitive.
Err: Damn, those are fast, man.
Ignignokt: We are not impressed.
Err: Hey, wasn't that cool?
The whole of the episode Gee-whiz - from the moment that they start to explain Standards and Practices until Ted Nugent comes out wearing a badger and everything before, after and in-between.
Ted Nugent: It is I, Ted Nugent, and if any of you don't got a gun, a knife, handkerchief, and a Chap-Stick, get the f[GUITAR RIFF]k outta here!
From earlier in the same episode, the Sound Effect Bleep resulting from said Standards And Practices. When Meatwad is supposedly "pregnant", at one point he launches into a foul-mouthed rant:
Meatwad: Oh boy, I apologise. My hormones are going nuts! Now please, if you would, get the [ELEPHANT TRUMPET] out of my way. I mean, how many times do I gotta [ALARM BELL] write ice cream on this [SQUEAK] list, before someone gets his [HORSE WHINNY] in gear, and brings home the [OWL HOOT] ice cream! Maybe I should get a steak knife and etch it in your mother[CORK POP] forehead! How hard can it [SQUEAK] be? Ice mother[FLOOR TOM] cream! I guess that's the price I pay for living with two [DIAL TONE] morons!
This exchange in "Super Computer" when Shake accuses Frylock of being a witch when Frylock's new supercomputer vanishes into thin air:
Frylock: I had to suspend the RAM in a colloidal fluid, (etc...)
Shake: Because you're a witch and you made it disappear with your evil magic!
Meatwad: He's a witch?!
Frylock: *deadpan* I'm not a witch.
Shake: Oh yeah!
Frylock: I'm not a witch!
Shake: Don't look at him wrong, he'll shrink your head to the size of a pea, I've seen it!
Frylock: Look, the hard drive spun so fast, it send the computer back in time.
Shake: To the time of witches, where you once lived! Bring forth the stakes! You shall burn for your beliefs, WITCH! *the door buzzer rings* My pizza's here! Pizza time pizza time pizza time!... *hops out of the room, still duct-taped to the chair*
Meatwad: It's all startin' to add up now, isn't it? The levitation. The eeevil book readin'. Dem cream cookies you always eatin'...you a damn witch!
Frylock: Oh yeah? Well whatcha you gonna do about it?
Meatwad: Eat pizza. Pizza time pizza time pizza time!... *exit*
Shake tells Meatwad Oog is his dad.
Shake: Hey Meatwad, your dad's here! He wants to make amends!
Meatwad: That ain't my daddie. Shake: Sure he is. I asked "are you Meatwad's dad?", he said "How'd you know? Yes I am."
In one episode Frylock makes a ray that can shrink or grow anything to any size. Carl wants to use it on his dick. At the end, he finally does.
Carl: Hello ladies, this is my friend Goliath. We had to order special elastic underwear for him over the internet.
Meatwad gains internet fame after a video of him vomiting while performing a song called "Chicken and Beans". He goes on tour and the fame, predictably, goes to his head:
MeatwadYou know what? Screw chicken and beans! I'm done with that. I ain't a dancing robot, I'm an artist and I need to create! You're all just beasts and animals shaking the bars of the cages in my zoo! And I am a magic unicorn astride a golden stalion picked up by two giant bronze grizzly bears! Now, Charity, Chastity; get over here and blow me before I go onstage. I have to lose 3 ounces so I can rock these leather chaps right proppa!
The scenes from the episode "The Marines" when Frylock goes to Canada to avoid the Marines after Meatwad enlists them all and winds up in a barn with "Canada" written in paint on the side with a Jigsaw-esque puppet on a television screen.
Frylock:[Wakes with Saw's Reverse Bear Trap on his face] Where am I?!
Puppet: Welcome to Canada, Frylock. The key to the trap on your head is implanted in your skull, just behind your right eye. On the table in front of you is a grapefruit and grapefruit spoon. Do the math.
Frylock: Wait, wait, wait, wait! What's the grapefruit for?!
Puppet:[pause] I'm not sure actually, I forgot. You think you could maybe... grab your jaw and just sort of rip your head open? I want to see inside there... RIP YOUR HEAD OPEN!
Puppet: Are you enjoying our little game?
Frylock: Yeah, it's over. I just took it off.
Puppet: You have sixty seconds... wait, what are you talking about?
Frylock: I just took it off. Here it is. See, right here.
Puppet: Oh wow, shoot.
Frylock: It was only a twist tie.
Puppet: From my whole wheat bread loaf! You found it! Bring it to me. You have sixty seconds..
Frylock: Where are you?
Puppet: I don't know! I'm a doll.
Frylock: Well hell, you must be somewhere. There's a camera on you.
Puppet: There's a camera on me? For real? What do I look like? [Holds pocket mirror to his face] Am I pretty?
Frylock: Is this all y'all do up in Canada?
Puppet: We speak French... sometimes. Pretty much this though.
Frylock: Look, I'm going back to the United States, okay?
Puppet: Wait, um, uh, why don't you jam that grapefruit spoon in your eye. Is that cool?
Frylock: Let me think about that. Umm, no.
Puppet: Come on, man. Don't be a dick. Do it..or else!
Frylock: Or else what?
Puppet:[Grapefruit catches on fire] Or else that! See what that did? What if you were eating that when that happened. ...nightmare!
Frylock: I am out of here.
Puppet: Wait... that key's still in your head.
Frylock: No it's not.
Puppet: Dammit! Just hack your foot off! Wait, Frylock! C'mon, don't go. We have universal health care here. It's free if you're a citizen.
Frylock: Nope. No thanks.
Puppet: C'mon man, hang out. I'm lonely.
And then there's a follow-up scene near the end with Meatwad.
Meatwad: What's in here?
Frylock: Why don't you go find out?
Meatwad: Okay. I'll do anything. [Enters barn]
Puppet: Wanna play a game?
Meatwad: No thank you. [Exits]
Puppet: Wait! Wait! Don't go, don't go! Come on, man! I've got all the Rush records. Come on, man. Please! Just come hang out with me! [In a defeated tone] Damn...