Chapter 58 of the manga: Ruri lost her glasses and her friend Raku and Onodera tries to help her find it. When they came to rather unseen bushes behind a building, Ruri tells Onodera to do obscene things to Raku, except she was was actually telling this to Raku.
The look Hana made when she explains why she didn't come to see Chitoge often. The top-class manager somehow became a totalCloud Cuckoo Lander when it comes to raising a child.
The Whiskey Bon Bon incident: five girls get drunk off of whiskey bon bons. Four of them try to seduce Raku, while the fifth starts ranting about economics.
The Marathon event, which basically turns into a war between the Class 1-C boys (led by Shuu) and Raku and his harem (plus Ruri). There's plenty of hilarious gambits and counter-gambits involved.
Ruri's "I-don't-really-care-but-I'm-still-kind-of-pissed-off-punch" on Shuu when he fails to mention the fact that she's in a shrine maiden outfit, after he had commented on the other girls' outfits.
Paula mocking the other girls' gunplay with water pistols at the pool.
The amnesic Raku gawking over Claude and Tsugumi's guns, not realizing that they're real.
Marika: "Maybe if I ransack Kosaki's room, I'll find more clues."
Raku and the girls go to hang their wishes on the bamboo, but they find that the bamboo is already covered in wishes- all of them from Marika and all of them about her getting together with Raku.
104: Marika asks Raku to take care of her parrot, whom she named Raku-sama, with honorifics, while she goes on a trip with her dad. It's actually a plan which culminates with Raku having to shout a confession addressed to Marika to the escaped parrot just to have him return. Marika had actually trained Raku-sama to return only when the confession is heard just so she could secretly record Raku's voice as he shouts it across town. Along the way the parrot promptly flies around town saying provocative (and fake) lines between Marika and Raku (like I said, fake), and in front of the other heroines no less. Fortunately, Marika soon arrives just in time to save Raku from the misunderstanding.
Kosaki actually can cook pretty well when she is depressed.
Any time Tsugumi appears alongside some Beehive contraption, Hilarity Ensues.