When you first meet Skullmageddon, he has a geisha sitting to each side, a red throne, and Marian being held by a giant six-armed statue. With a gesture of his hand, they lower into the ground. Then he speaks.
Jumping through the gates before the Mecha Biker fight, a la a Robot Master.
After going through Marian's magic love portal at the end, becoming the Ro-bros and destroying each and every mook in a single hit for 999 damage. It's just so satisfying after all you've gone through.
After being held captive for the entire game, as the credits have finished rolling, Marian catches the falling Skullmageddon. By punching him. For max damage. IN THE JUNK!