The entire scene with Scaramouche the Merciless. Are you kidding me?! After all these years, you're powerless against him! The 10th issue of the IDW series contains perhaps the most hilariously humiliating defeat of Aku yet. You are listening to the voice of AKU!!! Actually it was an episode where Jack found a man who had been raised by monkeys.
What's wrong with this door? It almost seems an honorable way to say goodbye to an iconic Cartoon Network villain. On a meta-level, this marked the last episode of the first 4 seasons, before the show was cancelled, before 13 ensuing years of loose ends and wondering if Jack ever made it back to the past. They travel together for entire seasons, with Jack getting closer to her as time passes, until he suddenly discovers she's really Aku. You haven't faced anything so powerful.
There's no more honor! Yes, not only did Jack fall for this trick again , but the relationship lasted longer than with Ikra. Compare that scene to the end of the episode , when Jack uses his new jumping skills to his advantage. You haven't faced anything so powerful. When she realizes she can't defeat Jack, she drops her weapon and cries, solemnly accepting that she can never save her people.
But I don't know anything. Surely he takes me for a fool to follow deeper into his trap. Aku is sneezing and coughing, and unenthusiastically croaking orders to his minions, looking miserable enough that Jack stares at him. Wait, back off, beardsly. For the love of god. I've seen cranky sheep more vicious!