Double (Shotaro): Well, let's see; there one, two - Bah! Never mind that now.
Shotaro skipping like a schoolgirl when he gets Wakana's autograph.
"The Girl A" ends with Phillip doing research on vinegar, covering a small table in shot glasses and assorted bottles, and for some obscure reason Shotaro takes two shot glasses and lets Akiko have one. The result? A DoubleSpit Take.
"Find The C". Street dancer Dango tries to enter his old school after a Dopant attack has it cordoned by the police - all it takes is Jinno rambling to himself for Dango to slip by him. Then Jinno notices Akiko instead, and what's his first reaction?
Jinno: "Amazing! A high scool boy turned into a middle school girl!" (Cue well-earned Dope Slap.)
"The F Afterglow". Philip "taking over" as Double to keep things diplomatic with Jin-san— even as Shotaro wants to clock him for his flip flopping opinion of Double..
Happens again in "Farewell, N!", Shotaro was mad as hell that Akiko didn't catch his falling body as Double went FangJoker.
'The Two of us are a single Kamen Singer!' Doubles as a Crowning Moment of Awesome when they get into it by singing one of the main battle themes.
That particular arc got in several good ones. Two notable moments are the reveal of just how epically Jimmy fails at music and Shoutaro chasing Jimmy across a beach during the sunset, complete with slow-mo, relaxing music, flying doves, and lampshade hanging.
The city people's duck-and-cover reactions before said singing starts is both this and a "Funny Aneurysm" Moment now.
Ryu: Do not question me! I've made my decision, Aki-P! I can't forgive myself for running back then. I've done my research. I will accept any kiss scene! This time I'll shake it off! No... (grabbing Akiko while beeps from Trial Form sound off again) Please let me shake it...
Akiko then tries to shake him off, Shotaro attempting to assist, but the Ryuu just grabs HIM, then we cut to Phillip with a comical kiss sound effect.
In the Gaia Memory Encyclopedia special (created because the Hyper Battle Video, which usually discussed various aspects of the series, forgot to do just that) Philip suddenly has Laser-Guided Amnesia and forgets everything related to Gaia Memories, leaving it up to Shotaro to help him recall what they. Then they get to the Trigger Memory.
Philip: I remember, Shotaro!
Philip: It's really fun to press it a bunch of times! Look!
And Shotaro taking his "hard-boiled" shtick to its logical conclusion. Let's just say it's not so applicable in practice.
The last of the Hardboiled Delusion Diaries involves Akiko, Ryu and Phillip wondering what it would be like if they were all "hard boiled" - which basically amounts to them doing their best Shotaro impression. That's just the half of it - there's also the fact that Renn Kiriyama is trying his darndest not to laugh.
Eternal: There are too many to count!note Also Harsher in Hindsight as this is actually explained in W Returns: Eternal
From earlier in W Forever - once Shotaro gets to Futo Tower, Gozo whacks him with his bo, then he flexes with an accompanying cobra hiss. What does Shotaro do?He mock-flexes as well with a hiss of his own!Bonus points for "Come on, MACHO MAN!"
In Movie War Megamax you have the entire scene where Shotaro meets Gentaro, and if it weren't for Eiji those two would've shouted for the rest of the movie.
More specifically, Shotaro's initial reaction to Gentaro is thinking that he's obnoxious, and Philip snarks that the two are peas in a pod. Shotaro's offended until Gentaro says that he's out to beat the villain who made his friends cry, and Shotaro does a 180 and calls Gentaro a good kid, and the two shout "RIGHT ON!" "YES SIR!" at each other ad infinitum until Eiji interrupts (and watching closely you can see Philip trying very hard not to laugh in the background).