Jackie Chan has a lot of these. Likely his first of such moments was when he first fought the Enforcers in a playground and defeated them with... windshield wipers. This was when the Enforcers first realized how awesome Jackie was.
Jade gets one in her Establishing Character Moments in the first episode: she somehow gets into Section 13 (a top-secret government facility) undetected, grabbed a motorized scooter and tried to "rescue" Jackie. Then she grabs the Rooster Talisman from the shield and Tohru has NO idea it was missing until he got back to the Dark Hand's HQ!
The first episode to feature Hak Foo was impressive ("I am Hak Foo, the last human you will ever lay eyes upon.")
Uncle had one when he made a fool of Hak Foo soon after his appearance (with some help from the immortality talisman, but still).
Jackie: "Jade! Uncle just leapt twenty feet into the air!"
Jade: "Go Uncle!"
He may have lost the fight, but seeing Uncle prepared for battle with Dao Lon Wong in "Viva Las Jackies" and having a blast-off with the other wizard was great. He should really take the time to prepare combat spells more often.
In the Hollywood episode, not only does Jade's Bavarian Fire Drill work to great effect (among other things, like getting the portal map), she BEAT UP a S13 agent that had just given JACKIE trouble (though Jackie was trying to train him, admittedly).
Jade, Jackie and Tohru all get one in the season 2 episode "The Good, The Bad, The Blind, The Deaf, And The Mute", when they overcome the disabilities placed on them by Daolon Wong, saving Uncle and stopping him in the process. "Not handicapped... handicapable!"
Shendu tearing through all of section 13 with only three of his talisman powers and not breaking a sweat.
Valmont managing to (temporarily) throw off Shendu's possession by touching the Panku Box and knocking him out.
Shendu finally gets his wish to possess Jackie right after possessing Valmont for the entirety of season 2. Then he rewrites reality and (temporarily) wins.
Egbert, an otherwise normal rooster, using the Rooster Talisman levitation powers, facing off against Tarakudo and his telekinesis power and drawing him into a stalemate. That rooster was utterly badass. Making it even better, Tarakudo only won through a cheap shot and was visibly struggling, while Eggbert didn't even FLINCH until Tarakudo fought dirty and nailed him!
Jade somehow breaking into Section 13 and steals all the talismans in order to save Jackie from a poison. This quote sums it all up.
Captain Black: (having seen Jade on the monitors) "She can be a secret agent when she grows up."
Also possibly a Call Back to an episode early in Season 1, where Jackie and Jade are moved into Section 13 for safety. Jade asks if this means she's a secret agent... cue Black and Jackie simultaneously going "No!"
To put it in clearer terms, she used a fishing line to steal Captain Black's ID off HIS SHIRT, while in a vent!
When Jade got trapped alone in the Demon Netherworld in the second season she was further captured by the Demon Sorcerers. This would be a worst case scenario for anyone and how does Jade handle it? She reveales that their brother Shendu lied to them, and that only ONE being can exit through Shendu's portal. This sets off a fight that she uses to get to the portal herself and escape, while still having time to blow a mock kiss at the Sky Demon right before she leaps through the portal and it closes, causing him to crash face-first into a rock!
Jade dueling the three Dark Chi Warriors into a standstill solely with the staff of the Chosen One.
El Toro Fuerte's stand against two Demon Generals in Ninja Twilight
"This bridge is closed"
Jade, with the aid of a couple of talismans, besting the freaking Sky Demon in an aerial duel.
Tarakudo hitting the Bishonen Line at the end of season four. Even without his telekinesis he's as dangerous as ever.
"Over my demon body."
The episode "Black Magic" finally gave Captain Black another chance to shine. Fighting and and outwitting his Super-Powered Evil Side was totally cool. Not to mention the fact that without the Oni Mask, his Dark Side didn't seem very dark at all. Even less than Jackie's, and he's the main hero of the show! In fact, his dark side had no complaints about rejoining with his lightside, unlike Dark Jackie.
Tiger and Pussycat, when they get their act together, beware.
Jade in the “Demon World” two-parter. By mere luck she and her memory of the real world are preserved when history is changed ushering in the Demon World. She then has to reacquaint Jackie with his martial arts skill, tell Uncle about the spells needed to reseal the demons and steal Shendu’s talismans, and gather up the J-Team from around the world to make a stand at the Book of Ages to rewrite history as it should be. And she succeeds!