Never pick a fight with an ugly person; they've got nothing to lose.

Framed as a comic “streetwise” maxim, the line warns against underestimating an opponent who lacks conventional social advantages. The humor hinges on a blunt, superficial premise (“ugly”), but the underlying point is about incentives: someone who feels they have little status or reputation to protect may be more willing to escalate, take risks, or ignore consequences. As a Robin Williams–style quip, it also plays with the mismatch between polite social norms and the raw calculus of conflict. Read more broadly, it cautions that desperation (or perceived desperation) can be a powerful motivator, and that picking fights—literal or figurative—often reveals more about the aggressor’s judgment than the target’s appearance.