[chokosaki]

With teens, I'd suggest some sort of fun team games. Or maybe you could try and provide them with a unique experience they didn't have as children with Halloween (something along the lines of using a Ouija board).

You could also try doing a pass the mic ghost story telling. Students sit in a circle and take turns telling a part of a ghost story. You start off the story, create the beginning and story set up and then 'pass the mic' to the person next to you. You could turn off the lights and use a flashlight as the mic.

It's not really a game, but it's a fun activity that encourages some creative use of English.