The scene that happens when you defeat Elvis for the first time. And the second time. Not so much the third time.
How do you go about fighting a giant fly? Why, spin your finger until it gets dizzy. It's a cultural joke: In Japan, it's believed that you can capture dragonflies by spinning your finger in front of its eyes to make it dizzy.
(Commenting on Debussy, a man with cymbals on his chest) "That is one loud set of man boobs."
After defeating Ravel for the first time, he appears to try to jump off the ship, but then simply walks over and hops off.
"God power keeps my pimp hand strong" — One of the most bizarre theme tunes ever.
"Hellish? I prefer 'Super-Tropical'!"
After defeating Shannon for the last time, Gene makes his way back to where he and Olivia are staying, only to find she's been kidnapped while he was away. Three goons appear and try to attack him one by one. Gene punches one out of an open window with such strength he's seen as a twinkling star. Another guy does it with the same result. The third guy tries to attack him, but Gene points his finger to him and gestures him to in front of the window. The thug stops and calmly walks over there; then he gets punched out the window.
Great Sensei's intro: He calmly steps out of the intra-dimensional door to his Dojo... then stumbles over the trim and slams headfirst into the ground. Gene seems more worried for his sake than intimidated.
Bruce: "What do the five fingers... uhhh... say... to the face?" note The pause is because he has maces in place of his hands; therefore, no fingers. That, or he wears some really sturdy mace-shaped gloves. Oh yeah, and he's a dimwit on top of that. Gene: (looks confused) Bruce: "SLAP!!!"
Then, to top it all off, the credits sequence. Hearing Gene's voice actor both sing an incredibly silly song and provide his own falsetto backup was the best possible way Clover could have ended such a game.