In "Teed Off", Mr. Bighead is having a rigged golf game with his boss because his coworkers and golf gardeners keep firing pianos to destroy his golf balls. Heffer, working as a gardener at the time, finds out and tries to make Bighead win (despite the fact he was SUPPOSE to lose). After a few shots of the balls getting in the holes, the coworkers get desperate and resort to rapid piano firing the poor toad to stitches, but still losing. Then on the last hole, Bighead shoots his ball to the opposite direction and into a lake, which means Mr. Dupette wins by default ...only for Heffer to reclaim the golf ball in the lake and raise from the water in a FLYING TRACTOR like a fighter plane (the razors usually pointed down were raised up like copters) and fly through the air to sink the ball into the hole. All the while dodging pianos homing in on him. And after he does, his tractor gets shot down and crash lands into the base of the piano launchers. Probably one of Heffer's most defining (if not random) moment of awesome.
The ending to "Rocko's Happy Sack", where Rocko threatens to "do something not nice" to Filburt if he doesn't change his mind about the 99% off sale finishing literally one second before Rocko's total is read off. It works.
Rocko: You cheap little rotter! I have been run over by a car, made to drag around a gimp shopping cart, threatened by your Gestapo security guards, had me head set on fire, I was attacked by wild lobsters, beaten by a very LARGE woman, had me dog wrapped in plastic, nearly starved to death and I still made the twelve o'clock deadline! So if you don't change that total back to a dollar fifty, I WILL DO SOMETHING NOT NICE!
Filburt: (nervous) That'll be one dollar and fifty cents, please...
And then there was the gorilla married to a manatee who was so disgusted at some random Jerkass professing Fantastic Racism towards sea mammals that he dragged the Jerkass off-screen and beat the crap out of him.
In "Jet Scream", Rocko has a rough time experiencing airplane travel, especially by a brat pig kid that is causing mischief to him (as well as the other passengers). When he gets fed up (and having his head filled with air when trying to listen to music via headphones), he nonchalantly grabs the kid while he's running around the aisle and STUFFS HIM in a cabinet above his seat. Immediately after, everyone stares at him like he's some sick fiend, but then suddenlystart cheering. You have to admit, he REALLY deserved that cheer.
In "Leap Frogs", despite Mrs. Bighead acting as a Mrs. RobinsonAbhorrent Admirer to Rocko for most of the episode, the minute Ed openly insults Bev and she begins to cry, Rocko calls Ed out on his cruelness and says Bev is a wonderful woman who could have any man she wants, culminating in him kissing Bev on the hand before leaving. It then leads to Bev and Ed making up and regaining the spark in their marriage, which is not destroyed by Status Quo Is God. Rocko actually saved the Bigheads' marriage.
In "Pranksters," Filbert pulls off an April Fools prank that puts Heffer through a massive Humiliation Conga.
In "Commuted Sentence," Rocko is constantly late for work and his car even gets impounded. After Mr. Smitty finally fires him, a depressed Rocko gets offered a new job: towing illegally parked cars. Turns out everyone in O-Town parks illegally, but guess whose car he comes across first.
The Q&A that followed this alluded to another meta moment. On the first day of recording lines, Charlie Adler had other things to do, so he wanted to get out of there as quickly as possible. Rather than read Ed's lines and then Bev's lines, he alternated back-and-forth, as well as channeling any frustration he had for how long it was all taking into his performances. Carlos Alazraqui recalled arriving as this was happening and being amazed.
"This guy was just this genius Phantom of the Opera at the microphone."
Virginia: You two should be ashamed of yourselves! One little argument, and you throw temper tantrums at other like a couple of spoiled children! Why, you're more important to each other than anyone else! Now, why don't you two run along and play?
In "Feist Geist", after realizing that a dab of Spirit Away ointment won't be enough to get rid of Mortimer Khan since he can jump from one host to another, Rocko orders an industrial size barrel of Spirit Away and has it hooked up to water guns. What follows is a badass Ghostbusters sequence in which Rocko and Heffer (and later Filburt) try to shoot down Mortimer Khan. One particular moment of awesome is Heffer going Rambo on Mortimer Khan when he possesses the fridge.
Heffer: You have no respect for food! Take THAAAAAAT!
At the end of "Power Trip", Rocko responds to his boss firing him for sticking up for Filburt by telling him off. The icing on the cake is Mr. Smitty's appalled reaction to Rocko having the gall to call him a "smothering old toad".
Rocko saving Heffer and the rest of the cattle at the climax of "The Good, the Bad, and the Wallaby". It inspired his uncle so much that he not only turned the Lazy I Ranch from a cattle farm to a cattle resort, but even sang an Award-Bait Songin his honor.
Rocko getting back at his former boss Mr. Dupette at the end of "Canned" for mercilessly firing him at the beginning of the episode. Namely by secretly offering him Conglom-O's Gene-Enhancing Chewing Gum which causes a beehive to sprout on his head upon chewing it and he gets attacked by the bee swarm.
Another meta one, Filburt and Dr. Hutchison getting married—apparently, Joe Murray had to fight hard to get Nickelodeon's higher-ups to approve of it, as they didn't typically allow characters to have such permanent forms of character development. The higher-ups finally approving of it was allegedly one of the most memorable moments in the show's history.