He has finally found the monkey and speaks in a serious tone: 

"Monkey, my arch nemesis, I have allowed you to live unpunished for too long. Ever since you stole my chicken crimpy shapes, I have sworn my entire life to taking my revenge and finally destroying you!"

He is trying to explain a complicated concept to the monkey seriously:

"Monkey, You don't seem to understand. I'm trying to kill you. You don't get to choose who gets to speak first or who gets the first line."

The rabbit has already won the fight and is explaining how the rat has missed such an obvious mistake (speak in normal speed):

"(laughter), allow me to explain. You see, I have written a statement of intention for my essay on Macbeth using the format of topic, point, comment and link and I solved a quadratic equation using the completing the square rule to find the parabola in turning point form... last month."