Bat Count Halloween Game
Here's how to play:
Cut many bats out of black construction paper. Make them different sizes. Stick them around the party area including the way into the party and the way to any other rooms that will be open. Write down the number of bats on a piece of paper and hide. Place paper and pencils out with the title Name and Number of Bats at the top. The person who is the closest to the number with out going over wins.
Information provided By Denise Witmer, About.com