Tell me what you laught at, and I’ll tell you who you are.

The saying proposes that humor is a diagnostic of character: what a person finds funny reveals their values, sympathies, and blind spots. Laughter can signal generosity (laughing with others), cruelty (laughing at others), or cynicism (laughing at ideals), and it often exposes what someone considers normal, absurd, or contemptible. In this sense, comedy becomes a moral and social “tell,” less controllable than formal self-description. The line also implies that taste in humor is culturally and psychologically patterned—shaped by class, education, and experience—so one’s laughter functions like an involuntary confession of identity.