Acting for Two: In the original, Jerry Lewis plays the lead, which is sort of two separate characters who happen to share a body that changes a little between the two of them.
In the 1996 film, Eddie Murphy plays the lead. He also plays the alternate persona. And a white celebrity fitness instructor... And his entire family (barring one child and one of the two grandparents).
Ascended Extra: Sherman's parents in the remake. The original film, they only appear twice, the first time shown as a henpecked guy and his mercilessly henpecking wife, and the second at the end where they come to sell the serum to all the kids in school. In the remake, they appear far more often, and get along quite well with each other.
The sequel of the Eddie Murphy version was actually called The Klumps, making Eddie Murphy's scenes with one actress and several of his own characters into the core of the film.
Sexier Alter Ego - In both versions, the titular professor invents a way to change him from a nerdy looking fellow in the original film (and a rather overweight guy in the remake) into a smooth ladies man.
Amazingly Embarrassing Parents: The Klumps when Sherman brings Carla over. They talk openly about sex, bodily functions, marriage, and other embarrassing topics, so much so that Sherman tries to slit his wrists with a butter knife.
Artistic License: Somatotypes. There are three main somatotypes which people can be classified in, and Sherman quite accurately describes one (Endomorph) while explaining why he was dieting to his parents in the first film. The formula he was working on was supposed to alter or deactivate endomorphic genes, allowing one to naturally lose more weight, and in the first scene with Shelly the hamster it is implied to do just that. However, when Sherman takes the serum, over half of his body fat mysteriously vanishes in about 30 seconds, and his skin shrinks to fit.
Carla: Professor, are you asking me out on a date? Sherman: *Bashful* Yes. Yes I am. Carla: I'd love to!
Body Horror: A completely tame example of this occurs whenever Buddy Love reverts back to Sherman Klump. Body parts become swollen as he regains all that excess body weight, and at one point he ends up with a grotesquely oversized lower lip.
Butt Monkey: Dean Richmond whenever there's a hamster around.
Heavy Voice: Played straight; the whole Klump family, Sherman Klump included, has a lower voice than Buddy Love, who inhabits the same body as Sherman but with less weight. In fact, of all the multiple characters he plays in both movies (being the Klumps besides Buddy Love), Buddy Love (even being the all time antagonist) is the only character Eddie Murphy plays using his real voice and appearance.
Also Granny Klump could be considered one because of how she not only talks the most cross of all the Klumps, but also because she is the least classy and is most crude and vulgar of them all. Even with the way she always insults Clesius and making them verbally always at each other's throats trading back and forth personal insults which always bothers Anna (Sherman's mother.) Not to mention how vulgar she is by going as far as the stunt she pulls on Buddy Love thinking that he is a male stripper which actually is bad enough to gross out a vulgarly perverted man like him to the point of making him vomit. These along with all the examples with her show you that she has the least moral conduct of all the Klumps.
Mean Boss / Dean Bitterman: Richmond, the dean of the university that Sherman Klump works at, frequently insults Sherman Klump's obesity and makes no secret of his contempt of Klump.
Jerk with a Heart of Gold: Despite this, he did ally with Sherman Klump to stop Buddy Love from stealing the patent for the fountain of youth formula in the climax of The Klumps.
Meaningful Echo: Buddy to Dean Richmond: "Who you think you talkin' to, Sherman Klump? Man, if you ever talk to me like that again, I'll kill you. And I don't mean it as euphemism, I'm gonna literally kill you. I'm gonna strangle you and cut off your air supply until you pass away."
Meaningful Name: The fact that the last name of the universally overweight Klumps sounds like plump is obvious. More so is that the slender love interest in the 2nd film is named 'Gains', especially when we're shown that Mrs. Klump's old wedding dress fits her.
You won't. I know you won't. As a matter of fact, I know you're going to be perfect! Do you know how I know all these things? I know them because if you're *not* perfect, nevermind the yelling, the screaming and the firing. If anything goes wrong, for any reason...I'm going to kill you. And I don't mean that as a euphemism, I am going to literally kill you. I'm going to strangle you and choke off your air supply until you pass away.
Oh, Crap: Sherman in the first film when he wakes up next to three hookers after a night of partying (as Buddy), especially when Carla shows up.
In the second one, when Buddy runs off after Sherman turns him back into a jello like substance, and he disintegrates. Luckily, it happens by a fountain, so when a tear from Denise drops on to his DNA structure and it lands in the water of it, Sherman is able to be revived by her and Clesius forcing him to drink it.
Sir Swears-a-Lot: All of the Klumps, except for Sherman. Mostly, Cletus. Buddy Love definitely becomes one. The insult comic Reggie Warrington is definitely by far.
Squirrels in My Pants: Variation: During a demonstration test on the fountain of youth serum on a hamster, it initially works, but thanks to Buddy Love sabotaging the serum earlier, the hamster ends up basically turning Godzilla on them, forcing the audience to evacuate and the guards to fire on "hamsterzilla" before it dispatched them with turds. It then sees Dean Richmond (wearing a fur rug over himself in a failed attempt to hide) and, mistaking Richmond for a potential mate, gets very interested in him and is also strongly implied to have raped him. As the cameras were still rolling, this was also shown on TV across the state, if not the nation or the world, as the scene in the Klumps' living room revealed.
It happened even earlier in the first film. Klump had accidentally let loose all the hamsters on the campus. one climbed into a student's pant legs. The girl he was talking to clearly mistook it as something else.
Stealth Pun: The theater scene in the sequel. The original Nutty Professor was made a year after Cape Fear, whilst in the remake's sequel, Buddy is laughing mad while watching the original in the style of De Niro's Max Cady's Iconic scene in the remake of Cape Fear.
Straight Man: Professor Sherman Klump. Debatably and most surely. Even though he's just as fat and kind of rugged looking as the rest of them, unlike how his enemy, Buddy Love looks, Sherman is the only one of all the Klumps who behaves most decent and most respectfully and is always good intentioned in all of his blunders. The only exception to his straightness might be when during the wedding dream scene that turns into a nightmare in the beginning of the second film, it appears that before the reverend says "I now pronounce you husband and wife", it appears that Sherman is staring at Carla's big breasts which have some cleavage in the wedding dress. It is followed by an erection scene following that which he is innocent from being because of being Buddy Love trying to come out of his trousers rather than being an erection caused by his lust for the assumingly noticed breast staring.
That Came Out Wrong: "Pardon me ladies and gentlemen, but I cannot go on living unless I have this man inside me right now!"
The Triple: Dean Richmond being a jerk to Sherman at the start of the movie.
Dean Richmond: Can I get you anything? Juice? Coffee? Rack of lamb?
Toilet Humor: The 1990s movie has a lot of fart jokes, as well as implied soiled pants. In both of them, the whole Klump family except for Sherman (including Buddy Love and some others) use foul language, and do socially revolting things.
Darker and Edgier: The Klumps had a few moments of that range from dark humor to horror. Buddy Love in the second movie is more evil than he ever was in the first nor its predecessor. Going from trying to take Sherman's place to downright trying to stalk and destroy Sherman and anyone else that got in the way. Even before his DNA was separated from Sherman's, Buddy even found many ways to attack him on the inside, especially by hijacking his mind randomly. From giving him a terrible nightmare to saying and doing rude and embarrassing stuff at delicate times that alienates him from his father and love interest. That aside there were Tear Jerker moments too, from relationship problems between Sherman's parents mirroring Sherman's relationship with Denise, as well as breaking off the marriage under the belief that he can't be a good husband after his intellect is deteriorating from what he went and did to get rid of Buddy, especially due to an incident where Buddy Love sabotaged the fountain of youth formula and stole the actual sample, causing a test gone awry. The audience was also almost fooled with a Bittersweet Ending, when we including Denise and Cletus thought Sherman was brain dead for good.
Even Evil Has Standards: Buddy Love (as sexually perverted as he is) draws the line at wanting to be a male stripper for the Klumps during their male stripping party, especially Granny. When she catches him in the bathroom, she mistakenly thinks that he is the stripper they called for, and to cover his real agenda of why he is there, he lets her believe it. In addition, rather than being turned on like he would a lot of other perverse things, he gets grossed out by seeing a cheeky non-attractive old Granny strip down and take her teeth out to give him a hickey kiss on the mouth even to the point of causing him to vomit. It is almost as though like she is a bigger pervert than him.
An exception with the oversexed Granny makes is during the scene at the beginning of the second movie in the wedding dream that turns into a nightmare, when a penis joke arises, which everybody in the ceremony thinks is Sherman suddenly having a blantant horny attack all of a sudden right in front of everyone. It is really Buddy Love suddenly coming out of Sherman by charging out of the crotch of his trousers to massively humiliate him. Anyway, during the part of that scene where Sherman's trousers are bulging in and out and before Buddy's head pops out of his fly, while Clesius Klump is yelling out "Show them what the Klumps are made of!" and Anna Klump is yelling out for him to "put it away", even the oversexed Granny Klump ends up saying "Calm down, boy, save it for the honeymoon."
For as much as all of the Klumps lack table manners except for Sherman, they do have a problem with Ernie Jr. running an ice cream dispenser and putting his mouth under it in a restaurant as he runs it. Especially Anna. As she is one to say "Please teach that boy some manners", she also gets down on Cletus for breaking gas at the table, not to mention when he even brings it up. Those both make her a hypocrite in a matter of speaking, though, because she is not embarrassed to bring up subjects like "colon cleansing" at the table.
Fan Disservice: Granny leaping through a field of daisies in a see-through nightgown.
It's Not You, It's Me: Sherman Klump ends up breaking off the marriage because he believes that he can't be a good husband while his intellect was deteriorating after removing Buddy Love from his system.
Power Walk: The Klumps as they're headed to an all-you-can-eat buffet, where they eat every last piece of food in the place except the salad.
Sexual Karma: The Jerk Ass dean gets more than his share of this, courtesy of "Jumbo the Horny Hamster".
Synchronized Swarming: In The Klumps, the professor proposes to his girlfriend by attracting fireflies into the words "Marry me?" using a synthesized firefly pheromone.
This Ain't Rocket Surgery: In The Klumps, Sherman, whose mind is decaying rapidly and is just about to meet Denise's parents, assures himself that he won't make a fool of himself because Denise's parents are probably not rocket scientists. Turns out that's exactly what they are.