Audio problem: As the camera looks at the delegates, it gets to the Japanese man. What is heard in no way matches his mouth's movements. Also, the British representative can be heard speaking a second or two after disappearing.
Audio problem: After Guinea Pig 4 disappears, the camera looks at Riddler and Catwoman. You hear Riddler giggling, but he has an astonished look on his face for a second and then giggles.
Answer: The Riddler doesn't sing at all. He yells to the henchmen on board, "Prepare to repell boarders!" He does it in a almost musical way, true, but there's no song.
CCARNI ★