* The original ARMS' debut all count.
** The first time [[SuperpoweredEvilSide Jabberwock]] awakens fully and rips through Egrigori's strike force, though it was also traumatic for Ryo.
** The first time [[KnightInShiningArmor White Knight]] and [[LightningBruiser White Rabbit]] awakens. The former utterly destroys Keith Red who was pretty much considered invincible at the time, while the latter took a nuclear bomb from downtown Tokyo to the bottom of the sea in a less than ten minutes while destroying anything in its path.
** The first time Queen of Hearts awakens. It's not as dramatic as the others on this list, but she managed to completely stop ''all 3 other original ARMS'' in one move. It really cements Kei's leadership role.
* Ryo finally accepting Jabberwock as a part of him, which in turn convinces Jabberwock to follow him instead of going on a rampage as usual. Also counts as a CrowningMomentOfHeartwarming.
** This is immediately followed by another CrowningMomentOfAwesome as Jabberwock engineers an antidote against an anti-ARMS virus injected into him earlier and proceeds to tear through the Red Caps in his new burning form.
* He's evil, but Kou Carnegie handily defeating Ryo, Takeshi, and Hayato after activating their ARMS can probably count as this.
* Hayato returning after going through TrainingFromHell where he gains his "Heart of Water" and handily defeating ''Kou Carnegie'', who, up until that point, was pretty much physically invincible. And he did it ''in human form''...well, half-human, but that does not make it any less BadAss.
* Iwao Takatsuki stopping Kou Carnegie and Stinger in one move and convincing them to work together to stop [[spoiler: White]]. There's a reason this man is the President of USA's top troubleshooter.
* The ARMS children taking on Egrigori's ARMS-enhanced soldiers as normal humans because their ARMS were de-powered and handily kicking their butts thanks to their battle experience. It gets even better when their ARMS ''do'' come back and tear through the now fully-evolved Egrigori ARMS users.
* Keith Blue activating his ARMS and the ensuing HeroicSacrifice, which weakens Humpty Dumpty enough for the others to fight him on equal footing.
* Iwao Takatsuki defeating James Huang [[spoiler: AKA Takatsuki Takashi]] with a piece of Jabberwock's claw which had transformed into an anti-ARMS beam blade. Keep in mind that the former is a [[BadassNormal completely normal human being]] while the latter was a fully-evolved ARMS user at that point.