Leela: Y'know, Zapp, once I thought you were a big, pompous buffoon. Then I realized that inside you were just a pitiful child. But now I realize that outside that child is a big, pompous buffoon!
Zapp Brannigan: And which one rocked your world?

You see, Killbots have a preset kill limit. Knowing their weakness, I sent wave after wave of my own men at them, until they reached their limit and shut down.