This episode is one of my favorites because it's Halloween and Christmas rolled into one, and they pulled it off perfectly. There is the old house, a tale of a lover's pact long ago, Mulder being Mulder and searching for ghosts on Christmas Eve (of all days), and Scully dragged along when she really wanted to be somewhere else. I liked the addition of Lily Tomlin and Ed Asner as the ghosts. They weren't what you expected, and they weren't what Mulder expected, either. Scully: "You know what's weird? Mulder, she's wearing my outfit." Mulder: "How embarrassing." Scully: "Well, you know what? He's wearing yours." And then they're off in this huge house that's a tricky maze.