Last night’s episode of Saturday Night Live saw the return of Kate McKinnon and the debut of host Billie Eilish, with the show utilizing both performers brilliantly in a chilling pre-taped sketch called “Lonely Christmas Ad.†The short introduces us to a sensitive teen (Eilish) who invites her lonely elderly neighbor (McKinnon) across the way to Christmas dinner, the two communicating via notepads à la Taylor Swift’s “You Belong With Me†music video. But things take a creepy turn as the elderly woman reveals increasingly alarming details about her life, culminating in several escalating twists too perfect to spoil. Though Mikey Day makes a memorable appearance, this sketch is essentially a two-hander for McKinnon and Eilish, who does her best comedic work of the night here. Watch the full sketch above.