Kurapika has successfully kidnapped Chrollo Lucifer, the head of the spiders. He plans to use him to bargain for Gon and Killua's safety. Back at the hotel, the rest of the spiders debate on whether he would actually go through with his plan. One of their cell phones ring. It's Kurapika. He tells them three demands that he wants the spiders to follow without argument, one of which is that they must not hurt Gon and Killua. The man replies that Gon and Killua put up so much of a struggle—what if a few of their bones were already broken?
Kurapika: (calmly) Then we're done negotiating. *hangs up phone*
Phinks: *calls him back, nervous* Sorry. I lied.
The way Gon and Killua treat Tsuzegura after he shows them his Ren.
The way Ging is shouted at by the entire Hunter Association for being a horrible dad.
Gon: Ging, can we talk more later? Ging: I dunno, I'm a pretty busy man. Hunter Association: ARE YOU FUCKING KIDDING ME GING?!?! AND YOU CALL YOURSELF A FATHER?! Hunter Association: GING'S THE WORST, GING'S THE WORST, GING'S THE WORST! Hunter Association: YOU NEED TO APOLOGIZE TO GON! PROMISE HIM "I'll be a good father from now onwards.''!!! Hunter Association: NO YOU KNOW WHAT?! YOU NEED TO STOP ACTING LIKE SOME GREAT, ALL-KNOWING DAD!!! Hunter Association: HAVE LEORIO PUNCH YOU AGAIN! Ging: What?! Guh!! This has nothing to do with you people!!!
Soon after, when the hunters all once again start yelling at Ging for his treatment of Gon, he responds by fighting every single person in the stands, hundreds of hunters at once and wins.
Killua explains to Gon the difference in strengths between Hisoka, Hanzo and himself by drawing lines on the ground that are about a foot in length, then he shows Gon's position by drawing a line of over several yards.
Much of the playful antics that occur between Gon and Killua. Also, with Gon's Incorruptible Pure Pureness and the fact that Killua is quite literally a child assassin, their opinion over matters clash often enough. This leads to Killua being at a loss at how to respond to Gon's naivete. Cue a few deadpan snarks and sweatdrops.
Early in the anime, Kurapika and Leorio argue over how Gon should go about his duties, should he become a Hunter. Kurapika believes that Hunters should be responsible, loyal defenders of all that is good. Leorio is all about the fame and fortune. Things get so heated, they end up shouting each other. Then failing to convince the other, they turn screaming to Gon, who's nervous, caught in the middle. The entire exchange basically sets up just how Kurapika and Leorio are so at odds. And it's funny.
When Hisoka finally gets a chance to fight Chrollo, only to learn that Kurapika sealed Chrollo's nen abilities, his face is the embodiment of "What."
Killua's reaction when finds out Gon is a KidAnova who has dated older women.