While most of the time, Jojo's Bizarre adventure is a serious battle manga, most of the cast is completely insane. Half the fun is watching them pull out incredibly zany schemes, hurt each other in increasingly ridiculous ways, or play off each other, with their own brands of Insane Troll Logic.
Speedwagon's reaction to Jonathan and Erina sharing a tender moment. "Speedwagon withdraws coolly."
Speedwagon begs Zeppeli to teach him the Ripple power as well. Zeppeli finally capitulates and hits Speedwagon in the torso with a pinkie just like he did with Jonathan...only Speedwagon merely doubles over in pain, causing Zeppeli to wonder if he hit the wrong spot in frustration.
Made better because Jonathan never used that, and he refers to it as if it was passed down the family line.
After his Training from Hell, Joseph shows off his new abilities by challenging a mugger to stab him. When he tries to do so, he stops the blade with one finger, and then pulls out a container of mustard and squirts it all over the mugger's head. After about a page or two of suspense, Joseph admits that that last part was just to mess with him.
At the end of the Hell Pillar Climb, Joseph is about to slip off the wall. Caesar grabs his wrist... only to remember that he's exhausted, too. "26 seconds later, after Joseph said 'Don't let go!' thirteen times..."
In the anime, Joseph peeks in on Lisa Lisa while she's bathing. Later, in Lisa Lisa's epilogue, after a mention of her being his mother, he can be seen with an utterly disgusted look on his face.
Polnareff nonchalantly offering Joseph some gum after the battle with Strength.
In part 3, Joseph is forced to land a jet.
Joseph: Hey, Jotaro. This'll be my third crash landing. Heh, have you ever known anyone who's ever crash landed a plane three times in their life? *Beat* Jotaro: I will never fly with you again!
Before taking the camel, Joseph suggests crossing the desert by helicopter. Jotaro reluctantly says that he's not flying with a guy who has crashed three times in his life.
Hell, the whole "I'll show you how to tame a camel!" scene. Once everything is over, Joseph is covered in comical bandages. And when the camel slobbers all over him, he tries to pass it off as sunscreen.
And then the incident with Mannish Boy marks the fourth time Joseph crashes a plane. At that time, Jotaro had to fly with his grandfather again. And yes, the plane crashes. Jotaro mutters "I just knew it" as it happens.
The gang's battle with Arabia Fats and his Sun stand. Especially when Kakyoin, Polnareff, and even Jotaro burst out laughing causing Joseph to think they've gone insane from the heat...then said tense moment becomes hilarious when it turns out they're laughing because they spotted a ridiculously obvious flaw in Arabia Fats' otherwise perfect concealment. Cue Jotaro taking the poor guy down with a single stone. It's almost worth it just to see Jotaro Kujo, hardass extraordinaire, laughing his head off.
Arguably funnier in the anime version, where during the scene when Kakyoin points out the flaw in the disguise and subsequent stone throw a sped up version of the music that normally plays when the tables are turned on the enemy runs in the background.
Joseph and Avdol's bizarre adventure while battling Mariah. Especially when they get into a spot of trouble in the ladies' bathroom.
Avdol: "Disasters in the bathroom" is Polnareff's department!
Then they try to unstick themselves from the magnetic attraction that Mariah's Bast Stand afflicted them with. Unfortunately, it requires Joseph to stand up straight with his back to a fence while Avdol slowly slides downward off of him, causing no end of embarrassment when some bystanders catch the two... with Avdol's face at groin level with Joseph. Not to mention when an old lady sees this, for she had been earlier smitten with Joseph's "daring" nature (It was Bast's fault) but switches gears and goes apeshit on the poor guys.
In Part 3, during Jotaro's poker game Batman Gambit against D'Arby, he keeps collected whilst D'Arby steadily goes even more insane. After the game is won, Abdul checks Jotaro's hand, only to find that rather than having a hand that could beat D'Arby's 4 kings hand, Jotaro had absolute garbage. Cue Abdul and the kid dealer nearly face faulting and said kid letting slip that he had been dealing Jotaro a bum hand on D'Arby's orders. When Jotaro asks said kid about it, the kid runs for the hills.
Jotaro repeatedly stealing various objects with his Stand while locked in a jail cell at the very start of the arc, somehow managing to snag RC cars, weights, motorcycle helmets, and an exercise bike. Some fridge humor comes into play when you realize that Star Platinum is a short range Stand.
When Polnareff runs into a still-living Avdol after he apparently died, he enthusiastically brings him back to the others, only for them to act completely nonchalant about it. They were all in on a plot to fake Avdol's death (with Hol Horse and J. Geil's unintentional help) and didn't tell poor Polnareff because they feared he had a loose tongue.
In a darkly comical way, the way Dio bluntly told Senator Wilson Phillips (who Dio was forcing to drive him around Cairo after the escaping Joseph and Kakyoin) that he wasn't going to let him go alive. Dio was so blunt with the poor guy, it's hard not to laugh.
Polnareff's first experience with an Indian toilet. A pig pokes its head up from the bowl. The bellhop hands Polnareff a stick with which to fend it off. And then the bellhop recommends letting the pig lick Polnareff's butt clean!
Hol Horse and Boingo's team up. When they're in an Egyptian taxi, Hol Horse is about to let Boingo out of the suitcase he was held captive in. Bear in mind, Boingo was on a plane, too, AND Bound and Gagged. The very first thing Boingo does when Hol Horse removes his gag? Puke all over him.
Hol Horse: Still a little airsick, are we?
Jotaro's reaction when he's called over to remove a mind control parasite from Polnareff. It's one of the few times you see him actually smiling.
On their way out of India, the heroes pick up the runaway girl from earlier, who's hitchhiking. She tries to get Kakyoin's attention by talking about how she'll have to wear a bra soon. The reaction?
Caption box pointing at the heroes: NO ONE CARES.
Anubis on being at the bottom of a river: "I'm so lonely!"
As the gang attempts to escape their submarine from Midler's High Priestess Stand, Joseph quickly trains them in underwater handsigns since they'll be wearing scuba masks. Polnareff shows off some signs he knows... which Kakyoin immediately figures out means "I can see your underwear." Polnareff bursts out laughing thanks to the mostly sensible Kakyoin getting it in one shot. Then they high-five and fist bump even as Joseph tells them off for messing about with the enemy right behind them.
The ending to the Wheel of Fortune chapter. Especially ZZ thinking he's killed Jotaro and proclaiming "I did it! I ended Part 3 early!" and Jotaro asking him who the main character's gonna be now ("And you better not say you.") Then the big reveal about ZZ...he's just a scrawny little guy with comically huge muscley arms. Cue the group bursting out laughing at his ridiculous appearance... and then laughing AGAIN when his Wheel of Fortune car Stand goes from a big muscle car to a smaller one which Joseph compares to a sheep losing its fur.
D'Arby: Are you going to hit me with your right hand?
Jotaro: (No. No. No.)
D'Arby: Are you going to hit me with your left hand?
Jotaro: (No. No. No.)
D'Arby: T-Then, are you going to use both hands?
Jotaro: (Yes. Yes. Yes.)
D'Arby: A-Are you going to do your "Ora Ora Ora"?!
Jotaro: (YES. YES. YES.) *asskicking ensures*
When Polnareff ends up at an inn being run, unbeknownst to him, by J. Geil's mother (who plans on killing him horribly after he killed him for killing his sister.) He keeps trying to make friendly conversation with her while inadvertently pushing her Berserk Button over and over until she's struggling to keep the facade up.
Diamond is Not Crash/Unbreakable
The Duwang scans. Any possibly dramatic or fairly serious moment is ruined by some of the most slapdash translation seen on a manga. Some of them have become outright memes in the community, with the more improved Part 4 scanlations retaining the more famous ones such as Koichi's "Get a feeling so complicated" as well as Kira's infamous "What a beautiful Duwang!"
Josuke: KOICHI REALLY STEALS? NO DIGNITY
It is worthy to note that Duwang really does improve towards the end, with scentences being legible and actually translated fairly well. Still hilarious, though.
Josuke's mother leaping onto Jotaro, thinking that he's Joseph, hugging him and telling him how much she missed "him." While still amusing, what made it hilarious was how stoically he reacted to having such a cheerful and cute young lady hugging onto him.
Their identical appearance is actually pointed out by Josuke at the beginning of the part. Upon seeing Jotaro, he thinks to himself "hey, that guy sorta looks like me!"
Part 4 has its moments, but the entirety of the arc, "I Am An Alien!", definitely deserves mention. Especially Mikitaka turning into a pair of dice and landing a perfect roll... while making Bruce Lee noises which even Josuke calls him out on.
The subsequent dice game scam that Josuke tries on Rohan afterward. And Rohan's house burning down yet Rohan not giving a damn about it because he's obsessed with trying to uncover Josuke's act of cheating.
The reveal of the latter part; Rohan and Tamami (called in as an impartial judge) are carefully studying the dice. Just when you think the sirens of passing fire trucks have given Mikitaka away (sirens make him break out in a rash in any form)...
Tamami: I've figured it out! The sirens were coming here! Your house is on fire!
During the aftermath of Rohan's house burning down (which he's convinced was caused by Josuke), Rohan keeps his cool.
Josuke: Uh, sorry about yesterday. The fire was, um, pretty bad, right?
Rohan: Yeah. I had a complete replica of the Drexel Heritage furniture used in the movie "Pretty Woman" valued at 2.5 million, which was damaged beyond repair. Not that I care or anything.
Josuke and Okuyasu eating at Trussardi's restaurant. Seriously, the entire thing! Especially the end where, even after ascertaining that Trussardi's not a bad guy, he still forces Josuke to stay behind and clean his kitchen top to bottom all because he busted into said kitchen without observing proper hygiene.
Old Joseph mishearing everything.
Okuyasu: 'Red Hot Chili Peppers'!
Old Joseph: 'Pop pop pop the popper'?
A minute later, Akira disguises himself as a SPW worker and attempts to assassinate Joseph. When caught, he fingers another worker as the assassin, only to get punched out straight away by Okuyasu. And when Akira asks how Okuyasu figured it out so quick...
Okuyasu: I was planning on punching the both of you. 'Cos I'm not too smart, ya know?
Okuyasu: Koichi! Starting today, don't take baths! And don't brush your teeth, and wear the same underwear everyday! And breed lice in your hair! And fart all the time too!
There's something darkly hilarious about Rohan and Josuke laughing with each other during their game, then Rohan slamming a knife into his own hand and cutting his finger off to show he's not fucking around.
Also comedic in a rather dark manner is all the shit that Kira goes through in order to get back his 'girlfriend'. It almost seems like something from a Three Stooges show. What it leads to, however...
A rare one from Kira.
Kira: By the way, do you have a tissue? Or a napkin, perhaps?
Koichi: I don't... Why do you ask?
Kira: I see... Well, you can use mine.
[Kira punches Koichi in the face]
Kira: Nosebleeds make a big mess, so I thought you might need one.
Jotaro makes a really narmy one-liner once he finally confronts Kira.
Jotaro: Nice watch. Too bad it won't be able to tell time after I break it. Break your face that is.
Then after kicking the shit out of him he gets closer to the astonished Kira and delivers the line again.
Jotaro: Yare, Yare. Now that I look at it up close your watch looks like crap, but you dont have to worry about that. After all, I am about to make it much worse, your face that is.
Another from Kira which has fast become a meme itself:
Kira: When I was a kid, I saw the Mona Lisa from my grammar school art book. The first time I saw her, with hands on her knee... How do I say this... I had a boner.
Even funnier is that despite coming from the above Duwang translation, it's actually completely accurate, down to the use of the word "boner" (the page has the kanji for "erection" in it).
When Josuke finally catches up to Yuuya Fungami, the user of the Highway Star Stand that nearly killed him and Rohan in the town's hospital, he finds that Fungami is merely a bed-ridden invalid, who tries to appeal to Josuke's good nature by asking whether he would really bully a weak and helpless cripple. To this, Josuke responds by healing his injuries with Crazy Diamond, and THEN while Yuuya is estatic about his recovery.
Jouske: "Yup you're all better now...it's a fair fight, now right?"
Echoes Act Three has disabled Sheer Heart Attack by increasing its weight. Sheer Heart Attack is linked to Kira's left hand. Which leads to the very satisfying sight of better-than-you jackass Yoshikage Kira being yanked to the ground by his suddenly-50-kilogram left hand.
Not just that, but what follows is a hilarious Humiliation Conga for Kira as he unintentionally causes properly damage with his left hand, is forced to pay for it, and then gets beat up by some random thugs.
What's even funnier is Koichi sticking the sound effect for heat sizzle in front of Sheer Heart Attack and allowed to run around the room while he was thinking.
As terrifying as Cheap Trick really is, some of the lengths its carriers go to avoid showing their back to people can get pretty silly.
The whole body-swap thing. But Mista and Trish reactions to it take the cake.
The group is eating, then Narancia accidentally stains some dude's clothes. The man gets angry and shouts and Narancia who, being Narancia, almost mechanically hits the man to unconsciousness. Then the rest of the group all gather around the unconscious man to wonder about whether the stain can be cleaned and how to do it. While the man is unconscious. Seemingly not noticing such unconsciousness. Comedic sociopathy, thy name is Jojo.
During a full cavity search, Jolyne begins to pose like a model. The two female cops don't seem to mind.
How does F.F. hide the Star Platinum disc? Enlarge her breasts and hide it in the cleavage.
Anytime Anasui tries to get a sweet moment with Jolyne; they're either just happenstance that he interprets as romantic opportunities or absurdly contrived set-ups by the man himself (such as getting FF to trip Jolyne just so she'll fall into his arms); either way, they usually end at his expense.
Jolyne flipping off Kenzo in four different languages.
Jolyne, after regaining her memory, sees she wrote a note to herself that says "Don't forget to wear your panties". Her realization is priceless.
Hermes tries to cheer up Xander.
Hermes: Whenever someone says "This Monday was a bad day," they'll say to themselves that "Saturday will be better." That's how we continue to live! No one lives a life of only Mondays!
Xander: I was arrested on a Saturday.
Even funnier: before that, Hermes offered Xander her panties. And he was actually interested, too (if only for a moment)!
Steel Ball Run
Stephen makes a horrible joke after going into a speech about a large block of ice holding the SBR trophy:
Stephen: Well, I think those comments broke the ice, don't you think?
Josuke needs to send Yasuho a text with Joushuu's phone, but Yasuho hates Joushuu. How he starts his text?
This isn't Joushuu.
He also signs off as "4 Balls", which Yasuho interprets as how much Dango he wants to eat at the restaurant he texted her to meet him at.
Norisuke on Stands:
Your Stand is like your asshole. You can't go around showing it off to other people.
Josuke's dramatic declaration of love towards Yasuho.
Norisuke: I see, so it's unrequited love...
Josuke: Urgh... That's also kind of... Um... Well... I guess we can go with that.
Tsurugi, after convincing Norisuke of keeping the strange-rock-skinned-wild dog (that Yotsuyu "healed"), ended up naming it as "Iwasuke" ("Iwa" means "rock"). No wonder why his grandpa and Josuke were not amused at it.