Teenage halloween games?

Hello, I'm throwing a halloween party for my teen and I'm stuck for entertainment. It'll be mostly dancing and talking but I need a great game or two to liven the party. There will be about 20-30 teenagers from 14-15 boys and girls so no kids games please!! A fortune teller and truth or dare might be good with a spooky twist and things like that mainly!! Also, something that will get the boys and girls to interact more because quite a few don't know each other. Thanks! J x