The very next day when Yuuta sees Rikka, she performs elaborate arm gestures and hand signs in front of a train door, the train door opening in a burst of Dramatic Wind, then she just casually strutting in. Yuuta misses the train as a result.
Rikka uses the Konami Code on a soda machine (long story). She gets a free drink.
Rikka and Yuuta's secret correspondence during a conference in the gym. Yuuta flicks the message on a bit of folded paper at her, she enters Bullet Time to snatch it between two fingers... and misses, the paper hitting her in the face. Cute "Ow!" included.
The end of Sanae's introduction in episode 3: twirling around and, after coming to a stop, getting tangled in her own hair.
Sanae annoying Yuuta, deliberately putting emphasis on "Dark Flame Master" in each sentence and getting stuffed in a locker for it.
Any time Yuuta or Shinka bring up memories of their chunibyou past and react in a panicked fit of shame.
Near the start of episode 4, Rikka and Sanae do a Men in Black parody, complete with sunglasses. Rikka wears the sunglasses under her eyepatch.◊
"My Wicked Eye...is yours!"
Yuuta coming back home and finding his little sister and Touka Playing House. Let me explain: a 20-something girl and a kindergartener playing together and in the middle of a... divorce and custody agreement!
In episode 1 of Ren, chunibyou!Kumin trying to attack Touka and failing miserably.
From the same episode, Shinka is a bit jealous that Sanae outscored her in tests, and gets to make the commencement speech to the new freshmen. So she flings a piece of paper, hitting Sanae in the forehead while she's up there. Sanae gets back at her by quoting an embarrassing line written by Shinka during her chunibyo phase. It seems to work, as Shinka is visibly disturbed by it.
Yuuta's reaction when Shinka attempts to take a picture of his magical girl costume in episode 3 of Ren - "a flawless parabola" indeed!
Ill Rikka sneaking out of her home, collapsing outside and turning her catchphrase onto her.
Ugh, the world is banishing me.
Rikka having major jealousy issues over an idol that Yuuta used to like.
Satone: His contract is with the eye of the wicked lord, not some magazine bimbo.
Rikka: And yet, there's still a voice inside me saying "Nooo!" and "Whyyy? and "AAAAAH!"
Satone: Wow, I had no idea you were so possessive.
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