Harley Quinn was introduced in Batman: The Animated Series in the early 1990s, voiced by Arleen Sorkin, and quickly became one of the show's most recognisable characters. The line 'Let's get back to basics' reflects her playful, direct style and works well outside its original episode because it needs no setup. As clips from the series spread through fan edits and soundboards, short character lines like I'm Batman became easy shorthand for a mood or a joke, and this Harley Quinn moment survives for the same reason: it is short, clear, and instantly recognisable.