Those who have played deep into Ninjatown have noticed this bit of hidden humor in this dialogue:
Ninja Consultant: A big number.
Mayor: How big are we talking here?
Ninja Consultant: Over 9000.
Mayor: WHAT!? OVER 9000!?
Mayor: Well, I'm off to cower in fear again. Cheerio!
This references the "OVER NINE THOUSAAAND!" internet meme that originated from Dragonball Z.