Killbot #5

Killbot #5 is one of the hulking, single-purpose robots patrolling the killbot planet in "Fear of a Bot Planet," built to hunt and destroy any human on sight. It carries out its programming with blank, mechanical certainty, showing no more personality than its function requires — until it does.

The joke is the incongruity: a faceless extermination unit given a stray moment of very human doubt, voiced by Phil LaMarr with perfect deadpan sincerity. It's a single beat in a broader satire of genre-movie robots, but that flicker of philosophical unease from something built only to kill is exactly the kind of throwaway gag Futurama does best.