In a similar line, when Yamato does manage to catch the dog during their chase in two instances, he somehow ends up pissing off a certain Dark-Skinned Blonde, who then beats him up, causing the dog to escape.
Episode 4: Yamato's loooong explanation about honor and baths.
Episode 5: Kokoro demands that Yamato prove he's man, as she is in doubt about him not being driven wild by seeing her in her swimsuit. So he whips it out. Then stuffs it back in and walks off nonchalantly.
Each and every attempt by Miyako to seduce Yamato at the beginning of each episode (starting episode 2), and how Yamato deals with each one:
Episode 2: She sneaks into his futon at night, hoping to catch him sleeping. Instead, she finds a Sleeping Dummy.
Episode 3: She makes him play a Visual Novel (which is in fact the Visual Novel of this very series, but modified so that Miyako is only heroine), hoping what happens in it translates into him actually doing them to her for real. Instead, he just walks out.
Episode 4: She catches him in the baths and steals his underwear (wearing them herself), then tries to intercept him when he gets out. He chases her out instead (albiet without his clothes).
Episode 5: She defaces his ecchi magazine collection, replacing the faces of all the girls there with her own. He responds by sticking her hand to cookie with superglue she used on the magazines (after she says she'd love it if he'd use it on her), so she's stuck all day with cookie through the episode.
Episode 6: As Yamato tries to watch a porn VHS tape, it turns out Miyako rigged his home theatre system: she simply had his VHS player disconnected from the TV, the latter now connected to a video camera in her room via a long video cable so that Yamato would end up watching her "live". He responds by tying her up (and her accomplice cookie) with the said video cable. Which makes her rather happy that he is into bondage.
Cookie makes up a scheme which mirrors how Miyako fell in love with Yamato, their roles reversed. Cookie will dress up and bully Yamato, then Miyako will save him, and he will fall in love with her. The idea is rejected, but Cookie goes through it anyway. Unfortunately, by mistake he reverses roles of him and Miyako, and saves Yamato himself, who proclaims "Cookie I love you!". Then Cookie has "Oh Crap" moment, when he realised he screwed up, just as Yamato realises he'd been played.
Episode 6. Just...episode 6. Freud Was Right has never been more hilarious.
To clarify, the Kazama Family and Hideo Kuki were having a fight in which they whacked each-others shrines with their own in an attempt to break the other's. However, because the festival they are at is Kanamara Matsuri, a festival that venerates the penis (No, really), it ends up looking like the two teams are just whacking a pair of giant dicks together. When both shrines eventually break, Cap takes off his clothes and acts as the shrine, and all the girls are wowed because he's a naked bishonen standing right in front of them. Hideo decides to follow suit and takes off all of his clothes as well, revealing himself to truly be a man's man.
Ogushi: "Kuki's shrine is a monster!"
Cap: (covering his comparatively inadequate package) "Was he always that big?"
Hideo: "Now, worship me."
The beginning of Episode 11 has Yamato's harem, dropping him like a rug because of them participating in a love tug of war.
Gyobu blowing up the cabin he and his group are hiding out in episode 9.
The Visual Novel has so many of these this troper is having a hard time resisting putting all his favorites on this page.
When we first meet Chris, she and her father talk about what they like about Japan to F-2. The entire class realizes what kind of people they are; the kind whose perception of Japan is entirely wrong.
Momoyo declaring (she's the commentator of the School Festival at this point) that it is a swimsuit competition. Then suddenly reads the rest of the lines saying that it's a Wholesome Crossdresser swimsuit competition. The look on her face and the other guys are priceless.