Carlton's basketball team and the coach's deadpan expression and remarks.
In "Banks Shot," Will notices the car keys on the table after his uncle has left. He has a conversation with his Shoulder Devil who tells him to take it and go to the pool hall; when he looks to his other shoulder for more advice, another Devil appears. "What are you, ignorant? Pick up the damn keys!"
Will, Carlton, Ashley and Hilary cooking Thanksgiving Dinner in "Talking Turkey."
Will and Carlton's mad dash to ask a girl they both see from opposite sides of the mall out at the end of the first part of "Someday Your Prince Will Be In Effect."
Geoffrey knows the lambada? "That's the forbidden dance!"
At the end of "Striptease for Two," Phil discovers that Will and Carlton have been stripping for cash to make back the money they lost from a bad stock tip. They break down and tell him that they also pawned one of Vivian's bracelets in order to get the money for the stock in the first place...and they never bothered to get the clasp fixed. Hearing all this, Phil begins to laugh, with Will joking that instead of punishing the two of them, he ought to reward them for their honesty, because "Hey...it worked for the Beav!" At this point, the three of them are laughing hysterically together, when suddenly Phil snaps: "DO I LOOK LIKE A WHITE GUYNAMED WARD?"
Phil: Now you get that bracelet back, and for the next six weeks, I don't want to hear you breathe...OR I'M CALLING THE FEDS MYSELF! (leaves)
Will: (scared) I guess this probably ain't the best time to tell him we ran over the mailbox.
In "Did the Earth Move For You?", the scene that YouTube users refer to as "The Earthquake Song" set to the tune of "Darling Nikki" by Prince.
Will: *singing* I'm stuck in a basement, sitting on a tricycle, girl gettin' on my nerves. * pause for audience laughter* Goin' out of my mind, I thought she was fine, don't know if her body is hers.
In "Ill Will," Will, Carlton and Hilary hide under Geoffrey's bed as Phillip and Vivian barge in to look for Geoffrey's memoir of the family. Phillip sits on the bed, crushing the three.
The revelation that Hilary was conceived at a Sly-Stone concert.
Will: And I hope those concert tickets weren't front row. Hilary: Is that why you always play "Hot Fun in the Summer Time" on my birthday? Carlton: And where was I conceived? Will: Probably at a white sale.
In the episode "Mama's Baby, Carlton's Maybe," Will is trying to comfort Carlton after his girlfriend leaves him at the wedding chapel and Carlton admits he is a virgin. When he first says it, a man walking by with his fiance who he just found out is pregnant says, "Well, at least somebody still is!"
Carlton: You mean you're a virgin too? Will: Keep your voice down man, I AIN'T NO VIRGIN!(woman in front of him gets up and leaves) Hey, look man, when it comes to me and the honeys I just say (priest walks up to him) de...no way! Ooh, ugh yucky!
"Poor Mom? Poor me! I saw Uncle Phil naked! And he was running!"
Will and Uncle Phil are trapped in an elevator at the hospital where Vivian is going into labor. Both are in desperate need of a phone to call Geoffrey at home, and it just so happens that they're trapped alongside a businessman who happens to have one...and who won't give it up. Will then decides to exercise his "straight-out-the-hood" negotiation skills on him, and we Gilligan Cut to...
Will: (dancing and singing) Please, can we use your phoooone? (stops) Yo, if you don't let us use your phone, I'ma start singing Paula Abdul's Greatest Hits!
And after the guy says something obnoxious, a shocked Will responds with: "Stop!Ghetto time!"
Will: That's right, boy! There's a new jack city! (high-fives Phil) You the man! You the man!
(The elevator breaks down)
Will: You the big man that broke the elevator!
The "take my hand!" running gag whenever Aunt Viv has a contraction.
In "Mommy Nearest," Will is shocked when his mom tells him that she's going to take him back with her to Philadelphia, as he wants to stay in Bel-Air and go to college. Will's fear is illustrated by his mom repeating the line faster and faster until it cuts to Stock Footage of an explosion.
And later, Will has an Imagine Spot of him still living with his mom as an old man.
And this awkward moment.
Mrs. Smith: You want to go back to Philadephia, don't you baby?
Will: Whoosh. (tosses his hat) Look what the wind did to my hat.
"Robbing the Banks" has the family hiring an ex-con as a handyman. They're naturally suspicious but Will constantly proclaims the man's innocence. Gilligan Cut to the entire living room empty of furniture and Will freaking out.
The Courtroom Antics that occur in "Will Goes a Courtin'", especially Phil and Will's sides of the story.
In Phil's version, Will and Carlton are thuggish, and everyone is wearing revealing swimsuits, including the 15-year-old neighbor girl who wandered over. Phil himself is just a meek, quiet man who accidentally steps on Carlton's inflatable duckie inner tube.
Not to mention Carlton's line: "HEY POPS! YOU POPPED MAH DUCK!"
In Will and Carlton's version, the pool party is a classy, innocent affair where everyone is in old-style bathing suits and they dance in a circle holding hands. As Phil enters, a glass of water shakes a la Jurassic Park and he rips the head off of Carlton's duckie inner tube. He also yells at the 15-year-old neighbor girl who "wandered over, crying" as Will says. ("Hit the bricks, you little tramp!")
Speaking of Carlton's duckie tube, he calls it "Howard". And he runs off crying like a little girl when Phil pops it just because he tried to stand up to his dad. This is in Will's side of the story too, only more exaggerated.
Season 4 ended with a Wham Line where Will decided to remain in Philadelphia with his mother. Season 5 opens with an NBC executive showing up and pointing out that his contract says "Fresh Prince of Bel-Air", then tossing him in a van and taking him back to California.
"Will's Misery" revolves around a prank in which Will is kidnapped, restrained and tortured by his date to teach him to respect women. When Will discovers Carlton was behind it all, he gets payback. Will tells Carlton about the abduction... except in this version, Will got loose and killed the girl with a rock. And her body's still up there. Carlton, in a fit of despair, runs out the back door, around the house into the living room, back into the kitchen dragging himself across the floor to the back door again, into and through the backwoods cabin, intothe audience, out the elevator into the University Cafeteria, and finally off-stage into Will's arms. Freeze scene, audio continues to play clapping, cut to black.
"Burning Down The House": Carlton tries to hitchhike his way home, which leads to this:
Hippie: So what I'm saying is there shouldn't be a "rich" or a "poor." We should all just share the wealth, man! Carlton: Oh, I beg to differ. (the hippies literally throw Carlton out of their microbus)
"Boxing Helena": Carlton's Drill Sergeant Nasty of a personal trainer demands he "drop and give him twenty." Carlton drops to his knees and offers him a twenty-dollar bill.
Carlton: Okay, but that doesn't leave much for yogurt!
Shatner actually refers to Will as Spock, but then says, "The ears are the same, but something's different."
Nearly all the Star Trek lines, with Will and Carlton filling in for other characters, are great. For example:
Carlton: Captain! Our dilithium crystals are almost gone! Shatner: Scotty! You're... ...BLACK!
Shatner: Ow, my tooth! Bones, do something! Will: Dammit, Jim, I'm a black boy from Philly, not a doctor!
Pretty much the entirety of the blooper reel episode. Some very good ones can be found here.
Will does Dreamgirls at the end of "The Script Formerly Known As".
In "I, Stank Horse," Carlton learns an aged racing horse is going to be put down. Later, as a devastated Carlton looks over pictures of the horse, Will turns on the TV to take his mind off horses.
Mister Ed: Hello. I'm Mister Ed. Carlton:(to Will) YOU BASTARD!
The entire montage of Uncle Phil throwing Jazz out of the house, the one time he threw Jazz inside the house when they were already outside and when Jazz got his revenge by throwing Uncle Phil out of the house.