Materials:  Paper, Safety pins

As each party-guest arrives, pin a card with a Halloween word or phrase onto their back.  The guest must try to guess the word or phrase by asking ‘yes’ or ‘no’ questions.  No peeking in a mirror or asking someone else to tell you what it says.  Correct guesses get a small prize like a miniature candy bar.  Ideas for on the back. 

Start with these words/phrases, or make up your own. 
Vampire
Witch
Pumpkin
Black Cat
Dracula
The Mummy
Werewolf
Trick or Treat
Headless Horseman
Ghost
Phantom
Specter
Bloody Mary
Wizard
Cauldron