Harley Quinn first appeared in Batman: The Animated Series in 1992 as the Joker's bubbly sidekick, with Arleen Sorkin defining her high-pitched Brooklyn accent. The character broke out far beyond her original sidekick role, becoming a pop-culture fixture across comics, games and films. Short reaction clips of her voice circulate widely on soundboards because her exaggerated delivery turns ordinary lines into comedy. It sits naturally beside other Batman universe reaction clips like I'm Batman, and fans keep using it wherever a thank-you needs a mischievous twist.