Yogostein forgot to declare war on humans until GP 3, despite letting the Monsters Of The Week run amok much earlier.
In GP 4, Gunpei tries to make a deal with a kid who accidentally got Gunpherd's Engine Cast. Being a roughneck, he's bad with kids, so he selected the method of approaching a Mafioso as Gunpherd suggests: In the classic drug-dealer ensemble, with a case full of candies. It didn't end well.
Gunpei again, in his lip-reading session of fail in GP 6.
Hanto and Gunpei's lake search in GP 7. The highlight of the scene is their surprised faces when something suddenly jumped out of the lake.
And most of the laughs aren't just from those two. Gunpei's towel rub in particular just seals his Fountain of Memes status.
Everything Hanto did in GP 14 in order to get back to wooing Rena-sannote (Unbeknownst to everyone, Kegareshia in disguise.): He broke the others from Enlightenednote (Don't ask.) Kamanote (Bath-heater) Banki's hot spring illusion, proceeded to curb-stomp him singlehandedly, guided the others with their poses and team attacks, and fired the Super Highway Buster at it alone. As if it's not enough, he grabbed the Engine Cast from the Ginjiro before Sosuke finished asking Bomper for them, but then he mixed up the Engine Soul and Engine Cast combinations. note (It's either a big WTF moment or a really hilarious one, depending on whether you're used to Super Sentai norms to know what they're spoofing.)
Hanto using the Super Highway Buster himself is also a moment of awesome.
Revisited in the Straw Banki episode later on. Sosuke's been brainwashed, and as our heroes approach the Straw Banki, Miu lets slip that she actually prefers the brainwashed Sosuke. Cue the awkward silence, apart from Renn dropping his weapon in shock.
Again in GP 26, but this time in the ending. After BearRV rejected Jetras after his one instance of "crossdressing" creeped her out, she said that there are lots of handsome guys around her that she can choose from. The boys, observing the situation from a distance, all quickly retreat the moment they heard her. Hiroto's reaction was especially funny.
Yogostein and Kitaneidas singing in drag is hilarious, if purely because their "drag" fails so bad.
In GP 34, "Devilish woman", Heater Banki says he's gonna cause mayhem, only when we next see him, an old man is using him to heat his food. Later we find him in a hair salon used as a hair dryer. And ends up burning Hiroto's hair no less! What really sells it is the fact that both times Heater Banki is just going along with it until he gets caught almost as if he forgets what he's supposed to be doing!
In GP 39, the Matsuri Banki curses Gunpei and Hanto with ugly masks that can't come off, when the core trio pull a Big Damn Heroes and extract them — but upon seeing two guys gibbering in ugly masks, the first thing Saki does is scream in fear and punch them in the face. Which actually gets the masks off.
Given that Toripter's gender was a source of much confusion until GP 38, watching HIM "laying" an egg in GP 41 is somewhat amusing. (The egg had become lodged in his hull, so he was sitting over it in full-size form)
GP 44: Hiroto and Saki end up in what appears to be a graveyard, where they are attacked by ghosts. After Saki convinces him to face his fears, she and Hiroto attack and defeat the ghosts...only to find out that they were actually in a theme parks' haunted house attraction, and just beat up a couple of actors.