Bastille brought out a very special guest to help perform their new single "Good Grief" on Ellen -- actress Kelly Le Brock of the seminal 1985 film Weird Science.
Le Brock appeared in a red dress similar to the one she wore iconically playing Lisa, the Frankenstein-inspired, manmade perfect girlfriend. Standing in a smoke-filled doorway, she spoke her memorable first line from the John Hughes film that the band samples to open their song: "So what would you little maniacs like to do first?"
From there, the band performed the smooth dance track, with the audience clearly feeling it. For her part, Le Brock just grooved on in the doorway, coming in again for another sample from the film later in the song.
Watch the performance here: