Where the Vulture ends up being Liz's dad. They just lull you into a false sense of security with the upbeat music, like 'hey guys, this is the fun bit of the movie - nothing bad could possibly happen! There may be something bad happening to interrupt the prom or something, but otherwise we're good for 5-10 minutes'. And then you see the Vulture open the door, and the music stops. Dead silence, voices have a bit of an echo to them and it just gets very heavy. It's a wonderful movie moment.