Superman TAS: Lois Lane asks Clark Kent how he always gets the best stories. Clark slyly tells her that he gets up close to the action constantly because he's actually Superman, to which Lane merely replies "You're a sick man, Kent."

Lucifer (show): The real archangel Lucifer runs a nightclub on Earth in Los Angeles. He constantly tells people, including the police, that he's the devil. Everyone assumes he's being metaphorical or grandiose.

Batman (Gotham Adventures v1 #35): Bruce Wayne can't ethically testify in court against someone he helped imprison as Batman, so he confesses his identity. Everyone simply laughs, and the judge sternly tells him off for joking.