As a Buffy the Vampire Slayer fan, I have fond memories of the Halloween episode in the second season. The storyline revolves around a plot to cause chaos via a spell that turns people into their costumes for real. Dressed as demon? Surprise, now those horns are real! It’s a fun episode, with some through-lines that last for the rest of the show (like Army Xander).
But one of my favorite parts is a small exchange between Buffy and BFF Willow while they’re shopping. In an attempt to convince her shy friend to take a chance on a more risque costume, Buffy tells Willow she’s missing the whole point of Halloween. (Hint: it’s not free candy.)