What show isn't improved upon by a good musical number? Otherwise tonal adventures such as Xena and Buffy have featured impromptu chorus numbers and dance routines not only to break from the traditional script but also as a way to gently lampoon themselves.
Batman has often proven ample fodder for other sorts of parodies, perhaps because the Dark Knight takes himself so seriously. In the October 23rd episode of his latest televised incarnation, The Brave and the Bold on Cartoon Network, the villanious Music Meister, played by Neil Patrick Harris, uses his own symphonic satire to bring down Gotham's defender. Courtesy Entertainment Weekly, here's a sneak peek at one such scene:
Hat tip to Dr. Horrible himself!