On Sunday night, The Simpsons aired its annual Halloween episode, Treehouse of Horror, which opened with Guillermo del Toro's brilliantly executed title sequence. An extended three-minute riff on the iconic couch gag, the Mexican director's treatment recast the citizens of Springfield into a seamless series of classic horror and thriller references, as well as nods to del Toro's oeuvre, from Cronos to Pacific Rim.